<optioned-regexp> ( string options -- regexp )
Regular expressions » Constructing regular expressions

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<regexp> ( string -- regexp )

Vocabulary
regexp

Inputs

string	a string
options	a string of Regular expression options

Outputs

regexp

a regexp

Word description
Given a string in regular expression syntax, and a string of options, creates a regular expression object. When it is first used for matching, a DFA is compiled, and this DFA is stored for reuse so it is only compiled once.

Definition

USING: accessors kernel regexp.ast regexp.parser sequences ;

IN: regexp

: <optioned-regexp> ( string options -- regexp )
    [ dup parse-regexp ] [ string>options ] bi*
    dup on>> reversed-regexp swap member?
    [ reverse-regexp new-regexp ] [ regexp new-regexp ] if ;