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Top Forums UNIX for Dummies Questions & Answers What is this? var2=${var1#??????????} Post 302298820 by vgersh99 on Wednesday 18th of March 2009 05:15:33 PM
Old 03-18-2009
Quote:
Originally Posted by vgersh99
'man ksh' yields:
Code:
     ${parameter%word}
           Remove Smallest  Suffix  Pattern.  The  word  will  be
           expanded to produce a pattern. The parameter expansion
           then will result in parameter, with the smallest  por-
           tion of the suffix matched by the pattern deleted.

     ${parameter%%word}
           Remove  Largest  Suffix  Pattern.  The  word  will  be
           expanded to produce a pattern. The parameter expansion
           then will result in parameter, with the  largest  por-
           tion of the suffix matched by the pattern deleted.

     ${parameter#word}
           Remove Smallest  Prefix  Pattern.  The  word  will  be
           expanded to produce a pattern. The parameter expansion
           then will result in parameter, with the smallest  por-
           tion of the prefix matched by the pattern deleted.

     ${parameter##word}
           Remove  Largest  Prefix  Pattern.  The  word  will  be
           expanded to produce a pattern. The parameter expansion
           then will result in parameter, with the  largest  por-
           tion of the prefix matched by the pattern deleted.

and a couple of examples:
Code:
     ${parameter%word}

     x=file.c
     echo ${x%.c}.o
     file.o

     ${parameter%%word}

     x=posix/src/std
     echo ${x%%/*}
     posix

     ${parameter#word}

     x=$HOME/src/cmd
     echo ${x#$HOME}
     /src/cmd

     ${parameter##word}

     x=/one/two/three
     echo ${x##*/}
     three

Code:
$ var1='123456789123456789'
$ var2=${var1#??????????}
$ echo $var2
23456789

 

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Mojolicious::Routes::Pattern(3pm)			User Contributed Perl Documentation			 Mojolicious::Routes::Pattern(3pm)

NAME
Mojolicious::Routes::Pattern - Routes pattern engine SYNOPSIS
use Mojolicious::Routes::Pattern; # Create pattern my $pattern = Mojolicious::Routes::Pattern->new('/test/:name'); # Match routes my $result = $pattern->match('/test/sebastian'); say $result->{name}; DESCRIPTION
Mojolicious::Routes::Pattern is the core of Mojolicious::Routes. ATTRIBUTES
Mojolicious::Routes::Pattern implements the following attributes. "defaults" my $defaults = $pattern->defaults; $pattern = $pattern->defaults({foo => 'bar'}); Default parameters. "format" my $regex = $pattern->format; $pattern = $pattern->format($regex); Compiled regex for format matching. "pattern" my $pattern = $pattern->pattern; $pattern = $pattern->pattern('/(foo)/(bar)'); Raw unparsed pattern. "quote_end" my $quote = $pattern->quote_end; $pattern = $pattern->quote_end(']'); Character indicating the end of a quoted placeholder, defaults to ")". "quote_start" my $quote = $pattern->quote_start; $pattern = $pattern->quote_start('['); Character indicating the start of a quoted placeholder, defaults to "(". "regex" my $regex = $pattern->regex; $pattern = $pattern->regex($regex); Pattern in compiled regex form. "relaxed_start" my $relaxed = $pattern->relaxed_start; $pattern = $pattern->relaxed_start('*'); Character indicating a relaxed placeholder, defaults to "#". "reqs" my $reqs = $pattern->reqs; $pattern = $pattern->reqs({foo => qr/w+/}); Regex constraints. "symbol_start" my $symbol = $pattern->symbol_start; $pattern = $pattern->symbol_start(':'); Character indicating a placeholder, defaults to ":". "symbols" my $symbols = $pattern->symbols; $pattern = $pattern->symbols(['foo', 'bar']); Placeholder names. "tree" my $tree = $pattern->tree; $pattern = $pattern->tree([ ... ]); Pattern in parsed form. "wildcard_start" my $wildcard = $pattern->wildcard_start; $pattern = $pattern->wildcard_start('*'); Character indicating the start of a wildcard placeholder, defaults to "*". METHODS
Mojolicious::Routes::Pattern inherits all methods from Mojo::Base and implements the following ones. "new" my $pattern = Mojolicious::Routes::Pattern->new('/:action'); my $pattern = Mojolicious::Routes::Pattern->new('/:action', action => qr/w+/); my $pattern = Mojolicious::Routes::Pattern->new(format => 0); Construct a new pattern object. "match" my $result = $pattern->match('/foo/bar'); my $result = $pattern->match('/foo/bar', 1); Match pattern against entire path, format detection is disabled by default. "parse" $pattern = $pattern->parse('/:action'); $pattern = $pattern->parse('/:action', action => qr/w+/); $pattern = $pattern->parse(format => 0); Parse a raw pattern. "render" my $path = $pattern->render({action => 'foo'}); my $path = $pattern->render({action => 'foo'}, 1); Render pattern into a path with parameters, format rendering is disabled by default. "shape_match" my $result = $pattern->shape_match($path); my $result = $pattern->shape_match($path, 1); Match pattern against path and remove matching parts, format detection is disabled by default. SEE ALSO
Mojolicious, Mojolicious::Guides, <http://mojolicio.us>. perl v5.14.2 2012-09-05 Mojolicious::Routes::Pattern(3pm)
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