PCRE is a widely used Unicode-compatible regular expression engine. It implements Perl5 regex syntax and semantics, some Python, .NET and Onigurama extensions. It uses just-in-time compilation, has consistent escaping rules, and allows for recursion, assertions and conditional patterns or complex subroutines and callouts, thus goes far beyond classic regular expressions.
major bugfix: 1. ChangeLog has the details of a lot of and tidies. 2. There has been a major re-factoring of the pcre2_compile.c file. Most syntax. Checking is now done in the pre-pass that identifies capturing groups. This has Reduced the amount of duplication and made the code tidier. While doing this, Some minor and Perl incompatibilities were (see ChangeLog for Details.) 3. Back references are now permitted in lookbehind assertions when there are. no duplicated group numbers (that is, (? has not been used), and, if the Reference is by name, there is only one group of that name. The referenced Group must, of course be of length. 4. g + (e.g. g +2 ) is now supported. It is a "forward back. Reference" and can be useful in repetitions (compare g - ). Perl does Not recognize this syntax. 5. pcre2grep now automatically expands its buffer up to a maximum set by. --max-buffer-size. 6. The -t option (grand total) has been added to pcre2grep. 7. A new function called pcre2_code_copy_with_tables() exists to copy a. Compiled pattern along with a private copy of the character tables that is Uses. 8. A user supplied a number of patches to upgrade pcre2grep under Windows and. Tidy the code. 9. Several updates have been made to pcre2test and test scripts (see. ChangeLog).