Regexp::Stringify(3) Stringify a Regexp object


This document describes version 0.05 of Regexp::Stringify (from Perl distribution Regexp-Stringify), released on 2016-03-15.


Assuming this runs on Perl 5.14 or newer.

use Regexp::Stringify qw(stringify_regexp);
$str = stringify_regexp(regexp=>qr/a/i); # '(^i:a)'
$str = stringify_regexp(regexp=>qr/a/i, with_qr=>1); # 'qr(a)i'
$str = stringify_regexp(regexp=>qr/a/i, plver=>5.010); # '(?:(?i-)a)'
$str = stringify_regexp(regexp=>qr/a/ui, plver=>5.010); # '(?:(?i-)a)'


stringify_regexp(%args) -> str

Stringify a Regexp object.

This routine is an alternative to Perl's default stringification of Regexp object (i.e.:"$re") and has some features/options, e.g.: producing regexp string that is compatible with certain perl versions.

If given a string (or other non-Regexp object), will return it as-is.

This function is not exported by default, but exportable.

Arguments ('*' denotes required arguments):

  • plver => str

    Target perl version.

    Try to produce a regexp object compatible with a certain perl version (should at least be >= 5.10).

    For example, in perl 5.14 regex stringification changes, e.g. "qr/hlagh/i" would previously be stringified as "(?i-xsm:hlagh)", but now it's stringified as "(?^i:hlagh)". If you set "plver" to 5.10 or 5.12, then this routine will still produce the former. It will also ignore regexp modifiers that are introduced in newer perls.

    Note that not all regexp objects are translatable to older perls, e.g. if they contain constructs not known to older perls like "(^...)" before perl 5.14.

  • regexp* => re
  • with_qr => bool

    If you set this to 1, then "qr/a/i" will be stringified as 'qr/a/i' instead as '(^i:a)'. The resulting string can then be eval-ed to recreate the Regexp object.

Return value: (str)


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This software is copyright (c) 2016 by [email protected].

This is free software; you can redistribute it and/or modify it under the same terms as the Perl 5 programming language system itself.