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17.19 pcre2el

“convert between PCRE, Emacs and rx regexp syntax”

• GitHub Source

pcre2el or rxt (RegeXp Translator or RegeXp Tools) is a utility for working with regular expressions in Emacs, based on a recursive-descent parser for regexp syntax. In addition to converting (a subset of) PCRE syntax into its Emacs equivalent, it can do the following:

• convert Emacs syntax to PCRE
• convert either syntax to rx, an S-expression based regexp syntax
• untangle complex regexps by showing the parse tree in rx form and highlighting the corresponding chunks of code
• show the complete list of strings (productions) matching a regexp, provided the list is finite
• provide live font-locking of regexp syntax (so far only for Elisp buffers – other modes on the TODO list)