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.IX Title "Sub::HandlesVia::HandlerLibrary::String 3"
.TH Sub::HandlesVia::HandlerLibrary::String 3 2026-08-30 "perl v5.42.2" "User Contributed Perl Documentation"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH NAME
Sub::HandlesVia::HandlerLibrary::String \- library of string\-related methods
.SH SYNOPSIS
.IX Header "SYNOPSIS"
.Vb 10
\&  package My::Class {
\&    use Moo;
\&    use Sub::HandlesVia;
\&    use Types::Standard \*(AqStr\*(Aq;
\&    has attr => (
\&      is => \*(Aqrwp\*(Aq,
\&      isa => Str,
\&      handles_via => \*(AqString\*(Aq,
\&      handles => {
\&        \*(Aqmy_append\*(Aq => \*(Aqappend\*(Aq,
\&        \*(Aqmy_chomp\*(Aq => \*(Aqchomp\*(Aq,
\&        \*(Aqmy_chop\*(Aq => \*(Aqchop\*(Aq,
\&        \*(Aqmy_clear\*(Aq => \*(Aqclear\*(Aq,
\&        \*(Aqmy_cmp\*(Aq => \*(Aqcmp\*(Aq,
\&        \*(Aqmy_cmpi\*(Aq => \*(Aqcmpi\*(Aq,
\&        \*(Aqmy_contains\*(Aq => \*(Aqcontains\*(Aq,
\&        \*(Aqmy_contains_i\*(Aq => \*(Aqcontains_i\*(Aq,
\&        \*(Aqmy_ends_with\*(Aq => \*(Aqends_with\*(Aq,
\&        \*(Aqmy_ends_with_i\*(Aq => \*(Aqends_with_i\*(Aq,
\&        \*(Aqmy_eq\*(Aq => \*(Aqeq\*(Aq,
\&        \*(Aqmy_eqi\*(Aq => \*(Aqeqi\*(Aq,
\&        \*(Aqmy_fc\*(Aq => \*(Aqfc\*(Aq,
\&        \*(Aqmy_ge\*(Aq => \*(Aqge\*(Aq,
\&        \*(Aqmy_gei\*(Aq => \*(Aqgei\*(Aq,
\&        \*(Aqmy_get\*(Aq => \*(Aqget\*(Aq,
\&        \*(Aqmy_gt\*(Aq => \*(Aqgt\*(Aq,
\&        \*(Aqmy_gti\*(Aq => \*(Aqgti\*(Aq,
\&        \*(Aqmy_inc\*(Aq => \*(Aqinc\*(Aq,
\&        \*(Aqmy_lc\*(Aq => \*(Aqlc\*(Aq,
\&        \*(Aqmy_le\*(Aq => \*(Aqle\*(Aq,
\&        \*(Aqmy_lei\*(Aq => \*(Aqlei\*(Aq,
\&        \*(Aqmy_length\*(Aq => \*(Aqlength\*(Aq,
\&        \*(Aqmy_lt\*(Aq => \*(Aqlt\*(Aq,
\&        \*(Aqmy_lti\*(Aq => \*(Aqlti\*(Aq,
\&        \*(Aqmy_match\*(Aq => \*(Aqmatch\*(Aq,
\&        \*(Aqmy_match_i\*(Aq => \*(Aqmatch_i\*(Aq,
\&        \*(Aqmy_ne\*(Aq => \*(Aqne\*(Aq,
\&        \*(Aqmy_nei\*(Aq => \*(Aqnei\*(Aq,
\&        \*(Aqmy_prepend\*(Aq => \*(Aqprepend\*(Aq,
\&        \*(Aqmy_replace\*(Aq => \*(Aqreplace\*(Aq,
\&        \*(Aqmy_replace_globally\*(Aq => \*(Aqreplace_globally\*(Aq,
\&        \*(Aqmy_reset\*(Aq => \*(Aqreset\*(Aq,
\&        \*(Aqmy_set\*(Aq => \*(Aqset\*(Aq,
\&        \*(Aqmy_starts_with\*(Aq => \*(Aqstarts_with\*(Aq,
\&        \*(Aqmy_starts_with_i\*(Aq => \*(Aqstarts_with_i\*(Aq,
\&        \*(Aqmy_substr\*(Aq => \*(Aqsubstr\*(Aq,
\&        \*(Aqmy_trim\*(Aq => \*(Aqtrim\*(Aq,
\&        \*(Aqmy_uc\*(Aq => \*(Aquc\*(Aq,
\&      },
\&    );
\&  }
.Ve
.SH DESCRIPTION
.IX Header "DESCRIPTION"
This is a library of methods for Sub::HandlesVia.
.SH "DELEGATABLE METHODS"
.IX Header "DELEGATABLE METHODS"
.ie n .SS "append( $tail )"
.el .SS "\f(CWappend( $tail )\fP"
.IX Subsection "append( $tail )"
Arguments: \fBStr\fR.
.PP
Appends another string to the end of the current string and updates the attribute.
.PP
.Vb 3
\&  my $object = My::Class\->new( attr => \*(Aqfoo\*(Aq );
\&  $object\->my_append( \*(Aqbar\*(Aq );
\&  say $object\->attr; ## ==> \*(Aqfoobar\*(Aq
.Ve
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS chomp()
.el .SS \f(CWchomp()\fP
.IX Subsection "chomp()"
Like \f(CW\*(C`chomp\*(C'\fR from perlfunc.
.ie n .SS chop()
.el .SS \f(CWchop()\fP
.IX Subsection "chop()"
Like \f(CW\*(C`chop\*(C'\fR from perlfunc.
.ie n .SS clear()
.el .SS \f(CWclear()\fP
.IX Subsection "clear()"
Sets the string to the empty string.
.PP
.Vb 3
\&  my $object = My::Class\->new( attr => \*(Aqfoo\*(Aq );
\&  $object\->my_clear;
\&  say $object\->attr; ## nothing
.Ve
.ie n .SS "cmp( $str )"
.el .SS "\f(CWcmp( $str )\fP"
.IX Subsection "cmp( $str )"
Arguments: \fBStr\fR.
.PP
Returns \f(CW\*(C`$object\->attr cmp $str\*(C'\fR.
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS "cmpi( $str )"
.el .SS "\f(CWcmpi( $str )\fP"
.IX Subsection "cmpi( $str )"
Arguments: \fBStr\fR.
.PP
Returns \f(CW\*(C`fc($object\->attr) cmp fc($str)\*(C'\fR. Uses \f(CW\*(C`lc\*(C'\fR instead of \f(CW\*(C`fc\*(C'\fR in versions of Perl older than 5.16.
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS "contains( $str )"
.el .SS "\f(CWcontains( $str )\fP"
.IX Subsection "contains( $str )"
Arguments: \fBStr\fR.
.PP
Returns true iff the string contains \f(CW$str\fR.
.ie n .SS "contains_i( $str )"
.el .SS "\f(CWcontains_i( $str )\fP"
.IX Subsection "contains_i( $str )"
Arguments: \fBStr\fR.
.PP
Returns true iff the string contains \f(CW$str\fR case\-insensitvely.
.ie n .SS "ends_with( $tail )"
.el .SS "\f(CWends_with( $tail )\fP"
.IX Subsection "ends_with( $tail )"
Arguments: \fBStr\fR.
.PP
Returns true iff the string ends with \f(CW$tail\fR.
.ie n .SS "ends_with_i( $tail )"
.el .SS "\f(CWends_with_i( $tail )\fP"
.IX Subsection "ends_with_i( $tail )"
Arguments: \fBStr\fR.
.PP
Returns true iff the string ends with \f(CW$tail\fR case\-insensitvely.
.ie n .SS "eq( $str )"
.el .SS "\f(CWeq( $str )\fP"
.IX Subsection "eq( $str )"
Arguments: \fBStr\fR.
.PP
Returns \f(CW\*(C`$object\->attr eq $str\*(C'\fR.
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS "eqi( $str )"
.el .SS "\f(CWeqi( $str )\fP"
.IX Subsection "eqi( $str )"
Arguments: \fBStr\fR.
.PP
Returns \f(CW\*(C`fc($object\->attr) eq fc($str)\*(C'\fR. Uses \f(CW\*(C`lc\*(C'\fR instead of \f(CW\*(C`fc\*(C'\fR in versions of Perl older than 5.16.
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS fc()
.el .SS \f(CWfc()\fP
.IX Subsection "fc()"
Returns \f(CWfc($object\->attr)\fR.
.ie n .SS "ge( $str )"
.el .SS "\f(CWge( $str )\fP"
.IX Subsection "ge( $str )"
Arguments: \fBStr\fR.
.PP
Returns \f(CW\*(C`$object\->attr ge $str\*(C'\fR.
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS "gei( $str )"
.el .SS "\f(CWgei( $str )\fP"
.IX Subsection "gei( $str )"
Arguments: \fBStr\fR.
.PP
Returns \f(CW\*(C`fc($object\->attr) ge fc($str)\*(C'\fR. Uses \f(CW\*(C`lc\*(C'\fR instead of \f(CW\*(C`fc\*(C'\fR in versions of Perl older than 5.16.
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS get()
.el .SS \f(CWget()\fP
.IX Subsection "get()"
Gets the current value of the string.
.PP
.Vb 2
\&  my $object = My::Class\->new( attr => \*(Aqfoo\*(Aq );
\&  say $object\->my_get; ## ==> \*(Aqfoo\*(Aq
.Ve
.ie n .SS "gt( $str )"
.el .SS "\f(CWgt( $str )\fP"
.IX Subsection "gt( $str )"
Arguments: \fBStr\fR.
.PP
Returns \f(CW\*(C`$object\->attr gt $str\*(C'\fR.
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS "gti( $str )"
.el .SS "\f(CWgti( $str )\fP"
.IX Subsection "gti( $str )"
Arguments: \fBStr\fR.
.PP
Returns \f(CW\*(C`fc($object\->attr) gt fc($str)\*(C'\fR. Uses \f(CW\*(C`lc\*(C'\fR instead of \f(CW\*(C`fc\*(C'\fR in versions of Perl older than 5.16.
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS inc()
.el .SS \f(CWinc()\fP
.IX Subsection "inc()"
Performs \f(CW\*(C`++\*(C'\fR on the string.
.ie n .SS lc()
.el .SS \f(CWlc()\fP
.IX Subsection "lc()"
Returns \f(CWlc($object\->attr)\fR.
.ie n .SS "le( $str )"
.el .SS "\f(CWle( $str )\fP"
.IX Subsection "le( $str )"
Arguments: \fBStr\fR.
.PP
Returns \f(CW\*(C`$object\->attr le $str\*(C'\fR.
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS "lei( $str )"
.el .SS "\f(CWlei( $str )\fP"
.IX Subsection "lei( $str )"
Arguments: \fBStr\fR.
.PP
Returns \f(CW\*(C`fc($object\->attr) le fc($str)\*(C'\fR. Uses \f(CW\*(C`lc\*(C'\fR instead of \f(CW\*(C`fc\*(C'\fR in versions of Perl older than 5.16.
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS length()
.el .SS \f(CWlength()\fP
.IX Subsection "length()"
Like \f(CW\*(C`length\*(C'\fR from perlfunc.
.PP
.Vb 2
\&  my $object = My::Class\->new( attr => \*(Aqfoo\*(Aq );
\&  say $object\->my_length; ## ==> 3
.Ve
.ie n .SS "lt( $str )"
.el .SS "\f(CWlt( $str )\fP"
.IX Subsection "lt( $str )"
Arguments: \fBStr\fR.
.PP
Returns \f(CW\*(C`$object\->attr lt $str\*(C'\fR.
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS "lti( $str )"
.el .SS "\f(CWlti( $str )\fP"
.IX Subsection "lti( $str )"
Arguments: \fBStr\fR.
.PP
Returns \f(CW\*(C`fc($object\->attr) lt fc($str)\*(C'\fR. Uses \f(CW\*(C`lc\*(C'\fR instead of \f(CW\*(C`fc\*(C'\fR in versions of Perl older than 5.16.
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS "match( $regexp )"
.el .SS "\f(CWmatch( $regexp )\fP"
.IX Subsection "match( $regexp )"
Arguments: \fBStr|RegexpRef\fR.
.PP
Returns true iff the string matches the regexp.
.PP
.Vb 4
\&  my $object = My::Class\->new( attr => \*(Aqfoo\*(Aq );
\&  if ( $object\->my_match( \*(Aq^f..$\*(Aq ) ) {
\&    say \*(Aqmatched!\*(Aq;
\&  }
.Ve
.ie n .SS "match_i( $regexp )"
.el .SS "\f(CWmatch_i( $regexp )\fP"
.IX Subsection "match_i( $regexp )"
Arguments: \fBStr|RegexpRef\fR.
.PP
Returns true iff the string matches the regexp case\-insensitively.
.PP
.Vb 4
\&  my $object = My::Class\->new( attr => \*(Aqfoo\*(Aq );
\&  if ( $object\->my_match_i( \*(Aq^F..$\*(Aq ) ) {
\&    say \*(Aqmatched!\*(Aq;
\&  }
.Ve
.ie n .SS "ne( $str )"
.el .SS "\f(CWne( $str )\fP"
.IX Subsection "ne( $str )"
Arguments: \fBStr\fR.
.PP
Returns \f(CW\*(C`$object\->attr ne $str\*(C'\fR.
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS "nei( $str )"
.el .SS "\f(CWnei( $str )\fP"
.IX Subsection "nei( $str )"
Arguments: \fBStr\fR.
.PP
Returns \f(CW\*(C`fc($object\->attr) ne fc($str)\*(C'\fR. Uses \f(CW\*(C`lc\*(C'\fR instead of \f(CW\*(C`fc\*(C'\fR in versions of Perl older than 5.16.
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS "prepend( $head )"
.el .SS "\f(CWprepend( $head )\fP"
.IX Subsection "prepend( $head )"
Arguments: \fBStr\fR.
.PP
Prepends another string to the start of the current string and updates the attribute.
.PP
.Vb 3
\&  my $object = My::Class\->new( attr => \*(Aqfoo\*(Aq );
\&  $object\->my_prepend( \*(Aqbar\*(Aq );
\&  say $object\->attr; ## ==> \*(Aqbarfoo\*(Aq
.Ve
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS """replace( $regexp, $replacement )"""
.el .SS "\f(CWreplace( $regexp, $replacement )\fP"
.IX Subsection "replace( $regexp, $replacement )"
Arguments: \fBStr|RegexpRef\fR, \fBStr|CodeRef\fR.
.PP
Replaces the first regexp match within the string with the replacement string.
.PP
.Vb 3
\&  my $object = My::Class\->new( attr => \*(Aqfoo\*(Aq );
\&  $object\->my_replace( \*(Aqo\*(Aq => \*(Aqa\*(Aq );
\&  say $object\->attr; ## ==> \*(Aqfao\*(Aq
\&
\&  my $object2 = My::Class\->new( attr => \*(Aqfoo\*(Aq );
\&  $object2\->my_replace( qr/O/i => sub { return \*(Aqe\*(Aq } );
\&  say $object2\->attr; ## ==> \*(Aqfeo\*(Aq
.Ve
.ie n .SS """replace_globally( $regexp, $replacement )"""
.el .SS "\f(CWreplace_globally( $regexp, $replacement )\fP"
.IX Subsection "replace_globally( $regexp, $replacement )"
Arguments: \fBStr|RegexpRef\fR, \fBStr|CodeRef\fR.
.PP
Replaces the all regexp matches within the string with the replacement string.
.PP
.Vb 3
\&  my $object = My::Class\->new( attr => \*(Aqfoo\*(Aq );
\&  $object\->my_replace_globally( \*(Aqo\*(Aq => \*(Aqa\*(Aq );
\&  say $object\->attr; ## ==> \*(Aqfaa\*(Aq
\&
\&  my $object2 = My::Class\->new( attr => \*(Aqfoo\*(Aq );
\&  $object2\->my_replace_globally( qr/O/i => sub { return \*(Aqe\*(Aq } );
\&  say $object2\->attr; ## ==> \*(Aqfee\*(Aq
.Ve
.ie n .SS reset()
.el .SS \f(CWreset()\fP
.IX Subsection "reset()"
Resets the attribute to its default value, or an empty string if it has no default.
.ie n .SS "set( $value )"
.el .SS "\f(CWset( $value )\fP"
.IX Subsection "set( $value )"
Arguments: \fBStr\fR.
.PP
Sets the string to a new value.
.PP
.Vb 3
\&  my $object = My::Class\->new( attr => \*(Aqfoo\*(Aq );
\&  $object\->my_set( \*(Aqbar\*(Aq );
\&  say $object\->attr; ## ==> \*(Aqbar\*(Aq
.Ve
.PP
A faster XS implementation may be used if Sub::HandlesVia::XS is installed.
.ie n .SS "starts_with( $head )"
.el .SS "\f(CWstarts_with( $head )\fP"
.IX Subsection "starts_with( $head )"
Arguments: \fBStr\fR.
.PP
Returns true iff the string starts with \f(CW$head\fR.
.ie n .SS "starts_with_i( $head )"
.el .SS "\f(CWstarts_with_i( $head )\fP"
.IX Subsection "starts_with_i( $head )"
Arguments: \fBStr\fR.
.PP
Returns true iff the string starts with \f(CW$head\fR case\-insensitvely.
.ie n .SS """substr( $start, $length?, $replacement? )"""
.el .SS "\f(CWsubstr( $start, $length?, $replacement? )\fP"
.IX Subsection "substr( $start, $length?, $replacement? )"
Arguments: \fBInt\fR, \fBOptional[Int]\fR, \fBOptional[Str]\fR.
.PP
Like \f(CW\*(C`substr\*(C'\fR from perlfunc, but is not an lvalue.
.ie n .SS trim()
.el .SS \f(CWtrim()\fP
.IX Subsection "trim()"
Like \f(CW\*(C`trim\*(C'\fR from builtin, but in\-place.
.ie n .SS uc()
.el .SS \f(CWuc()\fP
.IX Subsection "uc()"
Returns \f(CWuc($object\->attr)\fR.
.SH "EXTENDED EXAMPLES"
.IX Header "EXTENDED EXAMPLES"
.SS "Using eq for Enum"
.IX Subsection "Using eq for Enum"
.Vb 2
\&  use strict;
\&  use warnings;
\&  
\&  package My::Person {
\&    use Moo;
\&    use Sub::HandlesVia;
\&    use Types::Standard qw( Str Enum );
\&    
\&    has name => (
\&      is => \*(Aqro\*(Aq,
\&      isa => Str,
\&      required => 1,
\&    );
\&    
\&    has status => (
\&      is => \*(Aqrwp\*(Aq,
\&      isa => Enum[ \*(Aqalive\*(Aq, \*(Aqdead\*(Aq ],
\&      handles_via => \*(AqString\*(Aq,
\&      handles => {
\&        is_alive => [ eq  => \*(Aqalive\*(Aq ],
\&        is_dead  => [ eq  => \*(Aqdead\*(Aq ],
\&        kill     => [ set => \*(Aqdead\*(Aq ],
\&      },
\&      default => \*(Aqalive\*(Aq,
\&    );
\&    
\&    # Note: method modifiers work on delegated methods
\&    #
\&    before kill => sub {
\&      my $self = shift;
\&      warn "overkill" if $self\->is_dead;
\&    };
\&  }
\&  
\&  my $bob = My::Person\->new( name => \*(AqRobert\*(Aq );
\&  say $bob\->is_alive; ## ==> true
\&  say $bob\->is_dead;  ## ==> false
\&  $bob\->kill;
\&  say $bob\->is_alive; ## ==> false
\&  say $bob\->is_dead;  ## ==> true
.Ve
.PP
See also MooX::Enumeration and MooseX::Enumeration.
.SS "Match with curried regexp"
.IX Subsection "Match with curried regexp"
.Vb 2
\&  use strict;
\&  use warnings;
\&  
\&  package My::Component {
\&    use Moo;
\&    use Sub::HandlesVia;
\&    use Types::Standard qw( Str Int );
\&    
\&    has id => (
\&      is => \*(Aqro\*(Aq,
\&      isa => Int,
\&      required => 1,
\&    );
\&    
\&    has name => (
\&      is => \*(Aqro\*(Aq,
\&      isa => Str,
\&      required => 1,
\&      handles_via => \*(AqString\*(Aq,
\&      handles => {
\&        name_is_safe_filename => [ match => qr/\eA[A\-Za\-z0\-9]+\ez/ ],
\&        _lc_name => \*(Aqlc\*(Aq,
\&      },
\&    );
\&    
\&    sub config_filename {
\&      my $self = shift;
\&      if ( $self\->name_is_safe_filename ) {
\&        return sprintf( \*(Aq%s.ini\*(Aq, $self\->_lc_name );
\&      }
\&      return sprintf( \*(Aqcomponent\-%d.ini\*(Aq, $self\->id );
\&    }
\&  }
\&  
\&  my $foo = My::Component\->new( id => 42, name => \*(AqFoo\*(Aq );
\&  say $foo\->config_filename; ## ==> \*(Aqfoo.ini\*(Aq
\&  
\&  my $bar4 = My::Component\->new( id => 99, name => \*(AqBar #4\*(Aq );
\&  say $bar4\->config_filename; ## ==> \*(Aqcomponent\-99.ini\*(Aq
.Ve
.SH BUGS
.IX Header "BUGS"
Please report any bugs to
<https://github.com/tobyink/p5\-sub\-handlesvia/issues>.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
Sub::HandlesVia.
.SH AUTHOR
.IX Header "AUTHOR"
Toby Inkster <tobyink@cpan.org>.
.SH "COPYRIGHT AND LICENCE"
.IX Header "COPYRIGHT AND LICENCE"
This software is copyright (c) 2020, 2022 by Toby Inkster.
.PP
This is free software; you can redistribute it and/or modify it under
the same terms as the Perl 5 programming language system itself.
.SH "DISCLAIMER OF WARRANTIES"
.IX Header "DISCLAIMER OF WARRANTIES"
THIS PACKAGE IS PROVIDED "AS IS" AND WITHOUT ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.