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.\" ========================================================================
.\"
.IX Title "Text::ParseWords 3"
.TH Text::ParseWords 3 "2019-10-24" "perl v5.30.2" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
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.if n .ad l
.nh
.SH "NAME"
Text::ParseWords \- parse text into an array of tokens or array of arrays
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 6
\&  use Text::ParseWords;
\&  @lists = nested_quotewords($delim, $keep, @lines);
\&  @words = quotewords($delim, $keep, @lines);
\&  @words = shellwords(@lines);
\&  @words = parse_line($delim, $keep, $line);
\&  @words = old_shellwords(@lines); # DEPRECATED!
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
The &\fBnested_quotewords()\fR and &\fBquotewords()\fR functions accept a delimiter 
(which can be a regular expression)
and a list of lines and then breaks those lines up into a list of
words ignoring delimiters that appear inside quotes.  &\fBquotewords()\fR
returns all of the tokens in a single long list, while &\fBnested_quotewords()\fR
returns a list of token lists corresponding to the elements of \f(CW@lines\fR.
&\fBparse_line()\fR does tokenizing on a single string.  The &*\fBquotewords()\fR
functions simply call &\fBparse_line()\fR, so if you're only splitting
one line you can call &\fBparse_line()\fR directly and save a function
call.
.PP
The \f(CW$keep\fR argument is a boolean flag.  If true, then the tokens are
split on the specified delimiter, but all other characters (including
quotes and backslashes) are kept in the tokens.  If \f(CW$keep\fR is false then the
&*\fBquotewords()\fR functions remove all quotes and backslashes that are
not themselves backslash-escaped or inside of single quotes (i.e.,
&\fBquotewords()\fR tries to interpret these characters just like the Bourne
shell).  \s-1NB:\s0 these semantics are significantly different from the
original version of this module shipped with Perl 5.000 through 5.004.
As an additional feature, \f(CW$keep\fR may be the keyword \*(L"delimiters\*(R" which
causes the functions to preserve the delimiters in each string as
tokens in the token lists, in addition to preserving quote and
backslash characters.
.PP
&\fBshellwords()\fR is written as a special case of &\fBquotewords()\fR, and it
does token parsing with whitespace as a delimiter\*(-- similar to most
Unix shells.
.SH "EXAMPLES"
.IX Header "EXAMPLES"
The sample program:
.PP
.Vb 7
\&  use Text::ParseWords;
\&  @words = quotewords(\*(Aq\es+\*(Aq, 0, q{this   is "a test" of\e quotewords \e"for you});
\&  $i = 0;
\&  foreach (@words) {
\&      print "$i: <$_>\en";
\&      $i++;
\&  }
.Ve
.PP
produces:
.PP
.Vb 6
\&  0: <this>
\&  1: <is>
\&  2: <a test>
\&  3: <of quotewords>
\&  4: <"for>
\&  5: <you>
.Ve
.PP
demonstrating:
.IP "0" 4
a simple word
.IP "1" 4
.IX Item "1"
multiple spaces are skipped because of our \f(CW$delim\fR
.IP "2" 4
.IX Item "2"
use of quotes to include a space in a word
.IP "3" 4
.IX Item "3"
use of a backslash to include a space in a word
.IP "4" 4
.IX Item "4"
use of a backslash to remove the special meaning of a double-quote
.IP "5" 4
.IX Item "5"
another simple word (note the lack of effect of the
backslashed double-quote)
.PP
Replacing \f(CW\*(C`quotewords(\*(Aq\es+\*(Aq, 0, q{this   is...})\*(C'\fR
with \f(CW\*(C`shellwords(q{this   is...})\*(C'\fR
is a simpler way to accomplish the same thing.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Text::CSV \- for parsing \s-1CSV\s0 files
.SH "AUTHORS"
.IX Header "AUTHORS"
Maintainer: Alexandr Ciornii <alexchornyATgmail.com>.
.PP
Previous maintainer: Hal Pomeranz <pomeranz@netcom.com>, 1994\-1997 (Original
author unknown).  Much of the code for &\fBparse_line()\fR (including the
primary regexp) from Joerk Behrends <jbehrends@multimediaproduzenten.de>.
.PP
Examples section another documentation provided by John Heidemann 
<johnh@ISI.EDU>
.PP
Bug reports, patches, and nagging provided by lots of folks\*(-- thanks
everybody!  Special thanks to Michael Schwern <schwern@envirolink.org>
for assuring me that a &\fBnested_quotewords()\fR would be useful, and to 
Jeff Friedl <jfriedl@yahoo\-inc.com> for telling me not to worry about
error-checking (sort of\*(-- you had to be there).
.SH "COPYRIGHT AND LICENSE"
.IX Header "COPYRIGHT AND LICENSE"
This library is free software; you may redistribute and/or modify it
under the same terms as Perl itself.