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Tham khảo tài liệu 'handbooks professional java-c-scrip-sql part 218', công nghệ thông tin, kỹ thuật lập trình phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | 1.7 PCRE Lib The Perl Compatible Regular Expression PCRE library is a free-for-any-use open source regular expression library developed by Philip Hazel. PCRE has been incorporated into PHP Apache 2.0 KDE Exim MTA Analog and Postfix. Users of those programs can use the supported metacharacters listed in Table 1-26 through Table 1-30. The PCRE library uses a Traditional NFA match engine. For an explanation of the rules behind an NFA engine see Section 1.2. This reference covers PCRE Version 4.0 which aims to emulate Perl 5.8-style regular expressions. 1.7.1 Supported Metacharacters PCRE supports the metacharacters and metasequences listed in Table 1-26 through Table 1-30. For expanded definitions of each metacharacter see Section 1.2.1. Table 1-26. Character representations Sequence Meaning a Alert bell x07. b Backspace x08 supported only in character class. e ESC character x1B. n Newline x0A. r Carriage return x0D. f Form feed x0C. t Horizontal tab x0 9. octal Character specified by a three-digit octal code. xhex Character specified by a one- or two-digit hexadecimal code. x hex Character specified by any hexadecimal code. cchar Named control character. Table 1-27. Character classes and class-like constructs Class Meaning . A single character listed or contained in a listed range. r. A single character not listed and not contained within a listed range. class POSIX-style character class valid only within a regex character class. . Any character except newline unless single-line mode s . C One byte however this may corrupt a Unicode character stream. w Word character a - zA- z0-9_ . W Non-word character Aa- zA- z0-9_ . d Digit character 0-9 . D Non-digit character A0-9 . s Whitespace character n r f t . S Non-whitespace character K n r f t . Table 1-28. Anchors and zero-width tests Sequence Meaning a Start of string or after any newline if in multiline match mode m. A Start of search string in all match modes. End of search string or before a string-ending newline or
