regex

Libraries

• oniguruma
• re (python)
• RegExp (js)
• gem-oniguruma (ruby)
• re2:
• c#
• c++
• go

Styles

• C style
• Used in perl
• ICU (International Components for Unicode)
• Common for datetime formatters
• java.util.regex (java)
• icu.regex.pattern (c++)
• ns.regular.expression (swift)
• pi-reg* (php)

Types

• Basic Regular Expressions (BRE)
• Extended Regular Expressions (ERE)
• Perl Regular Expressions (PERL)