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Функции стандартной C-библиотеки

`pcrebuild` ( 3 )

Perl-совместимые регулярные выражения (Perl-compatible regular expressions)

Name | Building pcre | Pcre build-time options | Building 8-bit, 16-bit and 32-bit libraries | Building shared and static libraries | C++ support | Utf-8, utf-16 and utf-32 support | Unicode character property support | Just-in-time compiler support | Code value of newline | What \r matches | Posix malloc usage | Handling very large patterns | Avoiding excessive stack usage | Limiting pcre resource usage | Creating character tables at build time | Using ebcdic code | Pcregrep options for compressed file support | Pcregrep buffer size | Pcretest option for libreadline support | Debugging with valgrind support | Code coverage reporting | See also |

WHAT \R MATCHES

By default, the sequence \R in a pattern matches any Unicode newline sequence, whatever has been selected as the line ending sequence. If you specify

--enable-bsr-anycrlf

the default is changed so that \R matches only CR, LF, or CRLF. Whatever is selected when PCRE is built can be overridden when the library functions are called.

Исходный текст на man7.org