# phpman > info > Regexp::Common::whitespace

[Regexp::Common::whitesUser](https://www.chedong.com/phpMan.php/perldoc/Regexp%3A%3ACommon%3A%3AwhitesUser/markdown)(Contributed Perl [DocRegexp::Common](https://www.chedong.com/phpMan.php/perldoc/DocRegexp%3A%3ACommon/markdown)::[whitespace(3pm)](https://www.chedong.com/phpMan.php/man/whitespace/3pm/markdown)

NAME
       [Regexp::Common::whitespace](https://www.chedong.com/phpMan.php/perldoc/Regexp%3A%3ACommon%3A%3Awhitespace/markdown) -- provides a regex for leading or trailing
       whitescape

SYNOPSIS
           use [Regexp::Common](https://www.chedong.com/phpMan.php/perldoc/Regexp%3A%3ACommon/markdown) qw /whitespace/;

           while (<>) {
               s/$RE{ws}{crop}//g;           # Delete surrounding whitespace
           }

DESCRIPTION
       Please consult the manual of [Regexp::Common](https://www.chedong.com/phpMan.php/perldoc/Regexp%3A%3ACommon/markdown) for a general description
       of the works of this interface.

       Do not use this module directly, but load it via [Regexp::Common](https://www.chedong.com/phpMan.php/perldoc/Regexp%3A%3ACommon/markdown).

   $RE{ws}{crop}
       Returns a pattern that identifies leading or trailing whitespace.

       For example:

               $str =~ s/$RE{ws}{crop}//g;     # Delete surrounding whitespace

       The call:

               $RE{ws}{crop}->subs($str);

       is optimized (but probably still slower than doing the s///g
       explicitly).

       This pattern does not capture under "-keep".

SEE ALSO
       [Regexp::Common](https://www.chedong.com/phpMan.php/perldoc/Regexp%3A%3ACommon/markdown) for a general description of how to use this interface.

AUTHOR
       Damian Conway (<damian@conway.org>)

MAINTENANCE
       This package is maintained by Abigail (<regexp-common@abigail.be>).

BUGS AND IRRITATIONS
       Bound to be plenty.

       For a start, there are many common regexes missing.  Send them in to
       <regexp-common@abigail.be>.

LICENSE and COPYRIGHT
       This software is Copyright (c) 2001 - 2017, Damian Conway and Abigail.

       This module is free software, and maybe used under any of the following
       licenses:

        1) The Perl Artistic License.     See the file COPYRIGHT.AL.
        2) The Perl Artistic License 2.0. See the file COPYRIGHT.AL2.
        3) The BSD License.               See the file COPYRIGHT.BSD.
        4) The MIT License.               See the file COPYRIGHT.MIT.

perl v5.24.1                      2017-06-17   [Regexp::Common](https://www.chedong.com/phpMan.php/perldoc/Regexp%3A%3ACommon/markdown)::[whitespace(3pm)](https://www.chedong.com/phpMan.php/man/whitespace/3pm/markdown)