chickadee » chicken » irregex » sre->irregex

Compiles a regular expression from either a POSIX-style regular expression string (with most PCRE extensions) or an SCSH-style SRE. There is no (rx ...) syntax - just use normal Scheme lists, with quasiquote if you like.

Technically a string by itself could be considered a valid (though rather silly) SRE, so if you want to just match a literal string you should use something like (irregex `(: ,str)), or use the explicit (sre->irregex str).

The options are a list of any of the following symbols:

'i, 'case-insensitive

match case-insensitively

'm, 'multi-line

treat string as multiple lines (effects ^ and $)

's, 'single-line

treat string as a single line (. can match newline)

'utf8

utf8-mode (assumes strings are byte-strings)

'fast

try to optimize the regular expression

'small

try to compile a smaller regular expression

'backtrack

enforce a backtracking implementation

The 'fast and 'small options are heuristic guidelines and will not necessarily make the compiled expression faster or smaller.