/[pcre]/code/tags/pcre-8.00/doc/pcretest.txt
ViewVC logotype

Contents of /code/tags/pcre-8.00/doc/pcretest.txt

Parent Directory Parent Directory | Revision Log Revision Log


Revision 470 - (show annotations) (download)
Thu Oct 29 09:18:01 2009 UTC (4 years, 8 months ago) by ph10
File MIME type: text/plain
File size: 31477 byte(s)
Tag the 8.00 release.

1 PCRETEST(1) PCRETEST(1)
2
3
4 NAME
5 pcretest - a program for testing Perl-compatible regular expressions.
6
7
8 SYNOPSIS
9
10 pcretest [options] [source] [destination]
11
12 pcretest was written as a test program for the PCRE regular expression
13 library itself, but it can also be used for experimenting with regular
14 expressions. This document describes the features of the test program;
15 for details of the regular expressions themselves, see the pcrepattern
16 documentation. For details of the PCRE library function calls and their
17 options, see the pcreapi documentation.
18
19
20 OPTIONS
21
22 -b Behave as if each regex has the /B (show bytecode) modifier;
23 the internal form is output after compilation.
24
25 -C Output the version number of the PCRE library, and all avail-
26 able information about the optional features that are
27 included, and then exit.
28
29 -d Behave as if each regex has the /D (debug) modifier; the
30 internal form and information about the compiled pattern is
31 output after compilation; -d is equivalent to -b -i.
32
33 -dfa Behave as if each data line contains the \D escape sequence;
34 this causes the alternative matching function,
35 pcre_dfa_exec(), to be used instead of the standard
36 pcre_exec() function (more detail is given below).
37
38 -help Output a brief summary these options and then exit.
39
40 -i Behave as if each regex has the /I modifier; information
41 about the compiled pattern is given after compilation.
42
43 -M Behave as if each data line contains the \M escape sequence;
44 this causes PCRE to discover the minimum MATCH_LIMIT and
45 MATCH_LIMIT_RECURSION settings by calling pcre_exec() repeat-
46 edly with different limits.
47
48 -m Output the size of each compiled pattern after it has been
49 compiled. This is equivalent to adding /M to each regular
50 expression. For compatibility with earlier versions of
51 pcretest, -s is a synonym for -m.
52
53 -o osize Set the number of elements in the output vector that is used
54 when calling pcre_exec() or pcre_dfa_exec() to be osize. The
55 default value is 45, which is enough for 14 capturing subex-
56 pressions for pcre_exec() or 22 different matches for
57 pcre_dfa_exec(). The vector size can be changed for individ-
58 ual matching calls by including \O in the data line (see
59 below).
60
61 -p Behave as if each regex has the /P modifier; the POSIX wrap-
62 per API is used to call PCRE. None of the other options has
63 any effect when -p is set.
64
65 -q Do not output the version number of pcretest at the start of
66 execution.
67
68 -S size On Unix-like systems, set the size of the runtime stack to
69 size megabytes.
70
71 -t Run each compile, study, and match many times with a timer,
72 and output resulting time per compile or match (in millisec-
73 onds). Do not set -m with -t, because you will then get the
74 size output a zillion times, and the timing will be dis-
75 torted. You can control the number of iterations that are
76 used for timing by following -t with a number (as a separate
77 item on the command line). For example, "-t 1000" would iter-
78 ate 1000 times. The default is to iterate 500000 times.
79
80 -tm This is like -t except that it times only the matching phase,
81 not the compile or study phases.
82
83
84 DESCRIPTION
85
86 If pcretest is given two filename arguments, it reads from the first
87 and writes to the second. If it is given only one filename argument, it
88 reads from that file and writes to stdout. Otherwise, it reads from
89 stdin and writes to stdout, and prompts for each line of input, using
90 "re>" to prompt for regular expressions, and "data>" to prompt for data
91 lines.
92
93 When pcretest is built, a configuration option can specify that it
94 should be linked with the libreadline library. When this is done, if
95 the input is from a terminal, it is read using the readline() function.
96 This provides line-editing and history facilities. The output from the
97 -help option states whether or not readline() will be used.
98
99 The program handles any number of sets of input on a single input file.
100 Each set starts with a regular expression, and continues with any num-
101 ber of data lines to be matched against the pattern.
102
103 Each data line is matched separately and independently. If you want to
104 do multi-line matches, you have to use the \n escape sequence (or \r or
105 \r\n, etc., depending on the newline setting) in a single line of input
106 to encode the newline sequences. There is no limit on the length of
107 data lines; the input buffer is automatically extended if it is too
108 small.
109
110 An empty line signals the end of the data lines, at which point a new
111 regular expression is read. The regular expressions are given enclosed
112 in any non-alphanumeric delimiters other than backslash, for example:
113
114 /(a|bc)x+yz/
115
116 White space before the initial delimiter is ignored. A regular expres-
117 sion may be continued over several input lines, in which case the new-
118 line characters are included within it. It is possible to include the
119 delimiter within the pattern by escaping it, for example
120
121 /abc\/def/
122
123 If you do so, the escape and the delimiter form part of the pattern,
124 but since delimiters are always non-alphanumeric, this does not affect
125 its interpretation. If the terminating delimiter is immediately fol-
126 lowed by a backslash, for example,
127
128 /abc/\
129
130 then a backslash is added to the end of the pattern. This is done to
131 provide a way of testing the error condition that arises if a pattern
132 finishes with a backslash, because
133
134 /abc\/
135
136 is interpreted as the first line of a pattern that starts with "abc/",
137 causing pcretest to read the next line as a continuation of the regular
138 expression.
139
140
141 PATTERN MODIFIERS
142
143 A pattern may be followed by any number of modifiers, which are mostly
144 single characters. Following Perl usage, these are referred to below
145 as, for example, "the /i modifier", even though the delimiter of the
146 pattern need not always be a slash, and no slash is used when writing
147 modifiers. Whitespace may appear between the final pattern delimiter
148 and the first modifier, and between the modifiers themselves.
149
150 The /i, /m, /s, and /x modifiers set the PCRE_CASELESS, PCRE_MULTILINE,
151 PCRE_DOTALL, or PCRE_EXTENDED options, respectively, when pcre_com-
152 pile() is called. These four modifier letters have the same effect as
153 they do in Perl. For example:
154
155 /caseless/i
156
157 The following table shows additional modifiers for setting PCRE options
158 that do not correspond to anything in Perl:
159
160 /A PCRE_ANCHORED
161 /C PCRE_AUTO_CALLOUT
162 /E PCRE_DOLLAR_ENDONLY
163 /f PCRE_FIRSTLINE
164 /J PCRE_DUPNAMES
165 /N PCRE_NO_AUTO_CAPTURE
166 /U PCRE_UNGREEDY
167 /X PCRE_EXTRA
168 /<JS> PCRE_JAVASCRIPT_COMPAT
169 /<cr> PCRE_NEWLINE_CR
170 /<lf> PCRE_NEWLINE_LF
171 /<crlf> PCRE_NEWLINE_CRLF
172 /<anycrlf> PCRE_NEWLINE_ANYCRLF
173 /<any> PCRE_NEWLINE_ANY
174 /<bsr_anycrlf> PCRE_BSR_ANYCRLF
175 /<bsr_unicode> PCRE_BSR_UNICODE
176
177 Those specifying line ending sequences are literal strings as shown,
178 but the letters can be in either case. This example sets multiline
179 matching with CRLF as the line ending sequence:
180
181 /^abc/m<crlf>
182
183 Details of the meanings of these PCRE options are given in the pcreapi
184 documentation.
185
186 Finding all matches in a string
187
188 Searching for all possible matches within each subject string can be
189 requested by the /g or /G modifier. After finding a match, PCRE is
190 called again to search the remainder of the subject string. The differ-
191 ence between /g and /G is that the former uses the startoffset argument
192 to pcre_exec() to start searching at a new point within the entire
193 string (which is in effect what Perl does), whereas the latter passes
194 over a shortened substring. This makes a difference to the matching
195 process if the pattern begins with a lookbehind assertion (including \b
196 or \B).
197
198 If any call to pcre_exec() in a /g or /G sequence matches an empty
199 string, the next call is done with the PCRE_NOTEMPTY_ATSTART and
200 PCRE_ANCHORED flags set in order to search for another, non-empty,
201 match at the same point. If this second match fails, the start offset
202 is advanced by one character, and the normal match is retried. This
203 imitates the way Perl handles such cases when using the /g modifier or
204 the split() function.
205
206 Other modifiers
207
208 There are yet more modifiers for controlling the way pcretest operates.
209
210 The /+ modifier requests that as well as outputting the substring that
211 matched the entire pattern, pcretest should in addition output the
212 remainder of the subject string. This is useful for tests where the
213 subject contains multiple copies of the same substring.
214
215 The /B modifier is a debugging feature. It requests that pcretest out-
216 put a representation of the compiled byte code after compilation. Nor-
217 mally this information contains length and offset values; however, if
218 /Z is also present, this data is replaced by spaces. This is a special
219 feature for use in the automatic test scripts; it ensures that the same
220 output is generated for different internal link sizes.
221
222 The /L modifier must be followed directly by the name of a locale, for
223 example,
224
225 /pattern/Lfr_FR
226
227 For this reason, it must be the last modifier. The given locale is set,
228 pcre_maketables() is called to build a set of character tables for the
229 locale, and this is then passed to pcre_compile() when compiling the
230 regular expression. Without an /L modifier, NULL is passed as the
231 tables pointer; that is, /L applies only to the expression on which it
232 appears.
233
234 The /I modifier requests that pcretest output information about the
235 compiled pattern (whether it is anchored, has a fixed first character,
236 and so on). It does this by calling pcre_fullinfo() after compiling a
237 pattern. If the pattern is studied, the results of that are also out-
238 put.
239
240 The /D modifier is a PCRE debugging feature, and is equivalent to /BI,
241 that is, both the /B and the /I modifiers.
242
243 The /F modifier causes pcretest to flip the byte order of the fields in
244 the compiled pattern that contain 2-byte and 4-byte numbers. This
245 facility is for testing the feature in PCRE that allows it to execute
246 patterns that were compiled on a host with a different endianness. This
247 feature is not available when the POSIX interface to PCRE is being
248 used, that is, when the /P pattern modifier is specified. See also the
249 section about saving and reloading compiled patterns below.
250
251 The /S modifier causes pcre_study() to be called after the expression
252 has been compiled, and the results used when the expression is matched.
253
254 The /M modifier causes the size of memory block used to hold the com-
255 piled pattern to be output.
256
257 The /P modifier causes pcretest to call PCRE via the POSIX wrapper API
258 rather than its native API. When this is done, all other modifiers
259 except /i, /m, and /+ are ignored. REG_ICASE is set if /i is present,
260 and REG_NEWLINE is set if /m is present. The wrapper functions force
261 PCRE_DOLLAR_ENDONLY always, and PCRE_DOTALL unless REG_NEWLINE is set.
262
263 The /8 modifier causes pcretest to call PCRE with the PCRE_UTF8 option
264 set. This turns on support for UTF-8 character handling in PCRE, pro-
265 vided that it was compiled with this support enabled. This modifier
266 also causes any non-printing characters in output strings to be printed
267 using the \x{hh...} notation if they are valid UTF-8 sequences.
268
269 If the /? modifier is used with /8, it causes pcretest to call
270 pcre_compile() with the PCRE_NO_UTF8_CHECK option, to suppress the
271 checking of the string for UTF-8 validity.
272
273
274 DATA LINES
275
276 Before each data line is passed to pcre_exec(), leading and trailing
277 whitespace is removed, and it is then scanned for \ escapes. Some of
278 these are pretty esoteric features, intended for checking out some of
279 the more complicated features of PCRE. If you are just testing "ordi-
280 nary" regular expressions, you probably don't need any of these. The
281 following escapes are recognized:
282
283 \a alarm (BEL, \x07)
284 \b backspace (\x08)
285 \e escape (\x27)
286 \f formfeed (\x0c)
287 \n newline (\x0a)
288 \qdd set the PCRE_MATCH_LIMIT limit to dd
289 (any number of digits)
290 \r carriage return (\x0d)
291 \t tab (\x09)
292 \v vertical tab (\x0b)
293 \nnn octal character (up to 3 octal digits)
294 \xhh hexadecimal character (up to 2 hex digits)
295 \x{hh...} hexadecimal character, any number of digits
296 in UTF-8 mode
297 \A pass the PCRE_ANCHORED option to pcre_exec()
298 or pcre_dfa_exec()
299 \B pass the PCRE_NOTBOL option to pcre_exec()
300 or pcre_dfa_exec()
301 \Cdd call pcre_copy_substring() for substring dd
302 after a successful match (number less than 32)
303 \Cname call pcre_copy_named_substring() for substring
304 "name" after a successful match (name termin-
305 ated by next non alphanumeric character)
306 \C+ show the current captured substrings at callout
307 time
308 \C- do not supply a callout function
309 \C!n return 1 instead of 0 when callout number n is
310 reached
311 \C!n!m return 1 instead of 0 when callout number n is
312 reached for the nth time
313 \C*n pass the number n (may be negative) as callout
314 data; this is used as the callout return value
315 \D use the pcre_dfa_exec() match function
316 \F only shortest match for pcre_dfa_exec()
317 \Gdd call pcre_get_substring() for substring dd
318 after a successful match (number less than 32)
319 \Gname call pcre_get_named_substring() for substring
320 "name" after a successful match (name termin-
321 ated by next non-alphanumeric character)
322 \L call pcre_get_substringlist() after a
323 successful match
324 \M discover the minimum MATCH_LIMIT and
325 MATCH_LIMIT_RECURSION settings
326 \N pass the PCRE_NOTEMPTY option to pcre_exec()
327 or pcre_dfa_exec(); if used twice, pass the
328 PCRE_NOTEMPTY_ATSTART option
329 \Odd set the size of the output vector passed to
330 pcre_exec() to dd (any number of digits)
331 \P pass the PCRE_PARTIAL_SOFT option to pcre_exec()
332 or pcre_dfa_exec(); if used twice, pass the
333 PCRE_PARTIAL_HARD option
334 \Qdd set the PCRE_MATCH_LIMIT_RECURSION limit to dd
335 (any number of digits)
336 \R pass the PCRE_DFA_RESTART option to pcre_dfa_exec()
337 \S output details of memory get/free calls during matching
338 \Y pass the PCRE_NO_START_OPTIMIZE option to pcre_exec()
339 or pcre_dfa_exec()
340 \Z pass the PCRE_NOTEOL option to pcre_exec()
341 or pcre_dfa_exec()
342 \? pass the PCRE_NO_UTF8_CHECK option to
343 pcre_exec() or pcre_dfa_exec()
344 \>dd start the match at offset dd (any number of digits);
345 this sets the startoffset argument for pcre_exec()
346 or pcre_dfa_exec()
347 \<cr> pass the PCRE_NEWLINE_CR option to pcre_exec()
348 or pcre_dfa_exec()
349 \<lf> pass the PCRE_NEWLINE_LF option to pcre_exec()
350 or pcre_dfa_exec()
351 \<crlf> pass the PCRE_NEWLINE_CRLF option to pcre_exec()
352 or pcre_dfa_exec()
353 \<anycrlf> pass the PCRE_NEWLINE_ANYCRLF option to pcre_exec()
354 or pcre_dfa_exec()
355 \<any> pass the PCRE_NEWLINE_ANY option to pcre_exec()
356 or pcre_dfa_exec()
357
358 The escapes that specify line ending sequences are literal strings,
359 exactly as shown. No more than one newline setting should be present in
360 any data line.
361
362 A backslash followed by anything else just escapes the anything else.
363 If the very last character is a backslash, it is ignored. This gives a
364 way of passing an empty line as data, since a real empty line termi-
365 nates the data input.
366
367 If \M is present, pcretest calls pcre_exec() several times, with dif-
368 ferent values in the match_limit and match_limit_recursion fields of
369 the pcre_extra data structure, until it finds the minimum numbers for
370 each parameter that allow pcre_exec() to complete. The match_limit num-
371 ber is a measure of the amount of backtracking that takes place, and
372 checking it out can be instructive. For most simple matches, the number
373 is quite small, but for patterns with very large numbers of matching
374 possibilities, it can become large very quickly with increasing length
375 of subject string. The match_limit_recursion number is a measure of how
376 much stack (or, if PCRE is compiled with NO_RECURSE, how much heap)
377 memory is needed to complete the match attempt.
378
379 When \O is used, the value specified may be higher or lower than the
380 size set by the -O command line option (or defaulted to 45); \O applies
381 only to the call of pcre_exec() for the line in which it appears.
382
383 If the /P modifier was present on the pattern, causing the POSIX wrap-
384 per API to be used, the only option-setting sequences that have any
385 effect are \B and \Z, causing REG_NOTBOL and REG_NOTEOL, respectively,
386 to be passed to regexec().
387
388 The use of \x{hh...} to represent UTF-8 characters is not dependent on
389 the use of the /8 modifier on the pattern. It is recognized always.
390 There may be any number of hexadecimal digits inside the braces. The
391 result is from one to six bytes, encoded according to the original
392 UTF-8 rules of RFC 2279. This allows for values in the range 0 to
393 0x7FFFFFFF. Note that not all of those are valid Unicode code points,
394 or indeed valid UTF-8 characters according to the later rules in RFC
395 3629.
396
397
398 THE ALTERNATIVE MATCHING FUNCTION
399
400 By default, pcretest uses the standard PCRE matching function,
401 pcre_exec() to match each data line. From release 6.0, PCRE supports an
402 alternative matching function, pcre_dfa_test(), which operates in a
403 different way, and has some restrictions. The differences between the
404 two functions are described in the pcrematching documentation.
405
406 If a data line contains the \D escape sequence, or if the command line
407 contains the -dfa option, the alternative matching function is called.
408 This function finds all possible matches at a given point. If, however,
409 the \F escape sequence is present in the data line, it stops after the
410 first match is found. This is always the shortest possible match.
411
412
413 DEFAULT OUTPUT FROM PCRETEST
414
415 This section describes the output when the normal matching function,
416 pcre_exec(), is being used.
417
418 When a match succeeds, pcretest outputs the list of captured substrings
419 that pcre_exec() returns, starting with number 0 for the string that
420 matched the whole pattern. Otherwise, it outputs "No match" when the
421 return is PCRE_ERROR_NOMATCH, and "Partial match:" followed by the par-
422 tially matching substring when pcre_exec() returns PCRE_ERROR_PARTIAL.
423 For any other returns, it outputs the PCRE negative error number. Here
424 is an example of an interactive pcretest run.
425
426 $ pcretest
427 PCRE version 7.0 30-Nov-2006
428
429 re> /^abc(\d+)/
430 data> abc123
431 0: abc123
432 1: 123
433 data> xyz
434 No match
435
436 Note that unset capturing substrings that are not followed by one that
437 is set are not returned by pcre_exec(), and are not shown by pcretest.
438 In the following example, there are two capturing substrings, but when
439 the first data line is matched, the second, unset substring is not
440 shown. An "internal" unset substring is shown as "<unset>", as for the
441 second data line.
442
443 re> /(a)|(b)/
444 data> a
445 0: a
446 1: a
447 data> b
448 0: b
449 1: <unset>
450 2: b
451
452 If the strings contain any non-printing characters, they are output as
453 \0x escapes, or as \x{...} escapes if the /8 modifier was present on
454 the pattern. See below for the definition of non-printing characters.
455 If the pattern has the /+ modifier, the output for substring 0 is fol-
456 lowed by the the rest of the subject string, identified by "0+" like
457 this:
458
459 re> /cat/+
460 data> cataract
461 0: cat
462 0+ aract
463
464 If the pattern has the /g or /G modifier, the results of successive
465 matching attempts are output in sequence, like this:
466
467 re> /\Bi(\w\w)/g
468 data> Mississippi
469 0: iss
470 1: ss
471 0: iss
472 1: ss
473 0: ipp
474 1: pp
475
476 "No match" is output only if the first match attempt fails.
477
478 If any of the sequences \C, \G, or \L are present in a data line that
479 is successfully matched, the substrings extracted by the convenience
480 functions are output with C, G, or L after the string number instead of
481 a colon. This is in addition to the normal full list. The string length
482 (that is, the return from the extraction function) is given in paren-
483 theses after each string for \C and \G.
484
485 Note that whereas patterns can be continued over several lines (a plain
486 ">" prompt is used for continuations), data lines may not. However new-
487 lines can be included in data by means of the \n escape (or \r, \r\n,
488 etc., depending on the newline sequence setting).
489
490
491 OUTPUT FROM THE ALTERNATIVE MATCHING FUNCTION
492
493 When the alternative matching function, pcre_dfa_exec(), is used (by
494 means of the \D escape sequence or the -dfa command line option), the
495 output consists of a list of all the matches that start at the first
496 point in the subject where there is at least one match. For example:
497
498 re> /(tang|tangerine|tan)/
499 data> yellow tangerine\D
500 0: tangerine
501 1: tang
502 2: tan
503
504 (Using the normal matching function on this data finds only "tang".)
505 The longest matching string is always given first (and numbered zero).
506 After a PCRE_ERROR_PARTIAL return, the output is "Partial match:", fol-
507 lowed by the partially matching substring.
508
509 If /g is present on the pattern, the search for further matches resumes
510 at the end of the longest match. For example:
511
512 re> /(tang|tangerine|tan)/g
513 data> yellow tangerine and tangy sultana\D
514 0: tangerine
515 1: tang
516 2: tan
517 0: tang
518 1: tan
519 0: tan
520
521 Since the matching function does not support substring capture, the
522 escape sequences that are concerned with captured substrings are not
523 relevant.
524
525
526 RESTARTING AFTER A PARTIAL MATCH
527
528 When the alternative matching function has given the PCRE_ERROR_PARTIAL
529 return, indicating that the subject partially matched the pattern, you
530 can restart the match with additional subject data by means of the \R
531 escape sequence. For example:
532
533 re> /^\d?\d(jan|feb|mar|apr|may|jun|jul|aug|sep|oct|nov|dec)\d\d$/
534 data> 23ja\P\D
535 Partial match: 23ja
536 data> n05\R\D
537 0: n05
538
539 For further information about partial matching, see the pcrepartial
540 documentation.
541
542
543 CALLOUTS
544
545 If the pattern contains any callout requests, pcretest's callout func-
546 tion is called during matching. This works with both matching func-
547 tions. By default, the called function displays the callout number, the
548 start and current positions in the text at the callout time, and the
549 next pattern item to be tested. For example, the output
550
551 --->pqrabcdef
552 0 ^ ^ \d
553
554 indicates that callout number 0 occurred for a match attempt starting
555 at the fourth character of the subject string, when the pointer was at
556 the seventh character of the data, and when the next pattern item was
557 \d. Just one circumflex is output if the start and current positions
558 are the same.
559
560 Callouts numbered 255 are assumed to be automatic callouts, inserted as
561 a result of the /C pattern modifier. In this case, instead of showing
562 the callout number, the offset in the pattern, preceded by a plus, is
563 output. For example:
564
565 re> /\d?[A-E]\*/C
566 data> E*
567 --->E*
568 +0 ^ \d?
569 +3 ^ [A-E]
570 +8 ^^ \*
571 +10 ^ ^
572 0: E*
573
574 The callout function in pcretest returns zero (carry on matching) by
575 default, but you can use a \C item in a data line (as described above)
576 to change this.
577
578 Inserting callouts can be helpful when using pcretest to check compli-
579 cated regular expressions. For further information about callouts, see
580 the pcrecallout documentation.
581
582
583 NON-PRINTING CHARACTERS
584
585 When pcretest is outputting text in the compiled version of a pattern,
586 bytes other than 32-126 are always treated as non-printing characters
587 are are therefore shown as hex escapes.
588
589 When pcretest is outputting text that is a matched part of a subject
590 string, it behaves in the same way, unless a different locale has been
591 set for the pattern (using the /L modifier). In this case, the
592 isprint() function to distinguish printing and non-printing characters.
593
594
595 SAVING AND RELOADING COMPILED PATTERNS
596
597 The facilities described in this section are not available when the
598 POSIX inteface to PCRE is being used, that is, when the /P pattern mod-
599 ifier is specified.
600
601 When the POSIX interface is not in use, you can cause pcretest to write
602 a compiled pattern to a file, by following the modifiers with > and a
603 file name. For example:
604
605 /pattern/im >/some/file
606
607 See the pcreprecompile documentation for a discussion about saving and
608 re-using compiled patterns.
609
610 The data that is written is binary. The first eight bytes are the
611 length of the compiled pattern data followed by the length of the
612 optional study data, each written as four bytes in big-endian order
613 (most significant byte first). If there is no study data (either the
614 pattern was not studied, or studying did not return any data), the sec-
615 ond length is zero. The lengths are followed by an exact copy of the
616 compiled pattern. If there is additional study data, this follows imme-
617 diately after the compiled pattern. After writing the file, pcretest
618 expects to read a new pattern.
619
620 A saved pattern can be reloaded into pcretest by specifing < and a file
621 name instead of a pattern. The name of the file must not contain a <
622 character, as otherwise pcretest will interpret the line as a pattern
623 delimited by < characters. For example:
624
625 re> </some/file
626 Compiled regex loaded from /some/file
627 No study data
628
629 When the pattern has been loaded, pcretest proceeds to read data lines
630 in the usual way.
631
632 You can copy a file written by pcretest to a different host and reload
633 it there, even if the new host has opposite endianness to the one on
634 which the pattern was compiled. For example, you can compile on an i86
635 machine and run on a SPARC machine.
636
637 File names for saving and reloading can be absolute or relative, but
638 note that the shell facility of expanding a file name that starts with
639 a tilde (~) is not available.
640
641 The ability to save and reload files in pcretest is intended for test-
642 ing and experimentation. It is not intended for production use because
643 only a single pattern can be written to a file. Furthermore, there is
644 no facility for supplying custom character tables for use with a
645 reloaded pattern. If the original pattern was compiled with custom
646 tables, an attempt to match a subject string using a reloaded pattern
647 is likely to cause pcretest to crash. Finally, if you attempt to load
648 a file that is not in the correct format, the result is undefined.
649
650
651 SEE ALSO
652
653 pcre(3), pcreapi(3), pcrecallout(3), pcrematching(3), pcrepartial(d),
654 pcrepattern(3), pcreprecompile(3).
655
656
657 AUTHOR
658
659 Philip Hazel
660 University Computing Service
661 Cambridge CB2 3QH, England.
662
663
664 REVISION
665
666 Last updated: 26 September 2009
667 Copyright (c) 1997-2009 University of Cambridge.

Properties

Name Value
svn:eol-style native
svn:keywords "Author Date Id Revision Url"

webmaster@exim.org
ViewVC Help
Powered by ViewVC 1.1.12