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News about PCRE releases |
News about PCRE releases |
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Release 7.1 12-Mar-07 |
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There are no new features in this release. A few bugs are fixed (see ChangeLog |
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for details), but the major change is a complete re-implementation of the build |
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system. This now has full Autotools support and so is now "standard" in some |
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sense. It should help with compiling PCRE in a wide variety of environments. |
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Release 7.0 19-Dec-06 |
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This release has a new major number because there have been some internal |
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upheavals to facilitate the addition of new optimizations and other facilities, |
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and to make subsequent maintenance and extension easier. Compilation is likely |
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to be a bit slower, but there should be no major effect on runtime performance. |
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Previously compiled patterns are NOT upwards compatible with this release. If |
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you have saved compiled patterns from a previous release, you will have to |
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re-compile them. Important changes that are visible to users are: |
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1. The Unicode property tables have been updated to Unicode 5.0.0, which adds |
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some more scripts. |
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2. The option PCRE_NEWLINE_ANY causes PCRE to recognize any Unicode newline |
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sequence as a newline. |
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3. The \R escape matches a single Unicode newline sequence as a single unit. |
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4. New features that will appear in Perl 5.10 are now in PCRE. These include |
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alternative Perl syntax for named parentheses, and Perl syntax for |
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recursion. |
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5. The C++ wrapper interface has been extended by the addition of a |
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QuoteMeta function and the ability to allow copy construction and |
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assignment. |
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For a complete list of changes, see the ChangeLog file. |
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Release 6.7 04-Jul-06 |
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The main additions to this release are the ability to use the same name for |
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multiple sets of parentheses, and support for CRLF line endings in both the |
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library and pcregrep (and in pcretest for testing). |
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Thanks to Ian Taylor, the stack usage for many kinds of pattern has been |
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significantly reduced for certain subject strings. |
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Release 6.5 01-Feb-06 |
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Important changes in this release: |
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1. A number of new features have been added to pcregrep. |
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2. The Unicode property tables have been updated to Unicode 4.1.0, and the |
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supported properties have been extended with script names such as "Arabic", |
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and the derived properties "Any" and "L&". This has necessitated a change to |
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the interal format of compiled patterns. Any saved compiled patterns that |
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use \p or \P must be recompiled. |
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3. The specification of recursion in patterns has been changed so that all |
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recursive subpatterns are automatically treated as atomic groups. Thus, for |
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example, (?R) is treated as if it were (?>(?R)). This is necessary because |
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otherwise there are situations where recursion does not work. |
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See the ChangeLog for a complete list of changes, which include a number of bug |
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fixes and tidies. |
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Release 6.0 07-Jun-05 |
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The release number has been increased to 6.0 because of the addition of several |
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major new pieces of functionality. |
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A new function, pcre_dfa_exec(), which implements pattern matching using a DFA |
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algorithm, has been added. This has a number of advantages for certain cases, |
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though it does run more slowly, and lacks the ability to capture substrings. On |
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the other hand, it does find all matches, not just the first, and it works |
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better for partial matching. The pcrematching man page discusses the |
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differences. |
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The pcretest program has been enhanced so that it can make use of the new |
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pcre_dfa_exec() matching function and the extra features it provides. |
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The distribution now includes a C++ wrapper library. This is built |
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automatically if a C++ compiler is found. The pcrecpp man page discusses this |
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interface. |
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The code itself has been re-organized into many more files, one for each |
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function, so it no longer requires everything to be linked in when static |
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linkage is used. As a consequence, some internal functions have had to have |
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their names exposed. These functions all have names starting with _pcre_. They |
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are undocumented, and are not intended for use by outside callers. |
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The pcregrep program has been enhanced with new functionality such as |
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multiline-matching and options for output more matching context. See the |
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ChangeLog for a complete list of changes to the library and the utility |
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programs. |
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Release 5.0 13-Sep-04 |
Release 5.0 13-Sep-04 |
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