Add whitespace, line breaks and comments to clarify cryptic regular expressions| www.regular-expressions.info
PCRE2 (Perl Compatible Regular Expressions v2) is an open source library written in C that allows developers to add regular expression support to their applications. The library is compatible with a great number of C compilers and operating systems.| www.regular-expressions.info
PCRE (Perl Compatible Regular Expressions) is an open source library written in C that allows developers to add regular expression support to their applications. The library is compatible with a great number of C compilers and operating systems.| www.regular-expressions.info
Use regular expressions with the grep, regexp and sub functions in the base package of the R Project| www.regular-expressions.info