/[pcre]/code/trunk/HACKING
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revision 43 by nigel, Sat Feb 24 21:39:21 2007 UTC revision 49 by nigel, Sat Feb 24 21:39:33 2007 UTC
# Line 202  Forward assertions are just like other s Line 202  Forward assertions are just like other s
202  the opcodes OP_ASSERT or OP_ASSERT_NOT. Backward assertions use the opcodes  the opcodes OP_ASSERT or OP_ASSERT_NOT. Backward assertions use the opcodes
203  OP_ASSERTBACK and OP_ASSERTBACK_NOT, and the first opcode inside the assertion  OP_ASSERTBACK and OP_ASSERTBACK_NOT, and the first opcode inside the assertion
204  is OP_REVERSE, followed by a two byte count of the number of characters to move  is OP_REVERSE, followed by a two byte count of the number of characters to move
205  back the pointer in the subject string. A separate count is present in each  back the pointer in the subject string. When operating in UTF-8 mode, the count
206  alternative of a lookbehind assertion, allowing them to have different fixed  is a character count rather than a byte count. A separate count is present in
207  lengths.  each alternative of a lookbehind assertion, allowing them to have different
208    fixed lengths.
209    
210    
211  Once-only subpatterns  Once-only subpatterns
# Line 239  the compiled data. Line 240  the compiled data.
240    
241    
242  Philip Hazel  Philip Hazel
243  February 2000  August 2000
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