* http://rzr.online.fr/isbn/0-596-00415-X
  * [[sed]] http://libregamewiki.org/Sedtris
  * http://regexlib.com/Search.aspx?k=url
  * http://thp.io/2012/regexwars/# GamE
  * https://regexper.com/
  * https://regexr.com/589ii# SemVer


==== Shell ====

http://www.gnu.org/software/bash/manual/bashref.html#Shell-Parameter-Expansion

  t='main.exe' ; echo ${t/.exe/}
  #| main

  echo ${EMAIL/@/(a)}
  echo ${PWD// /_} 

  echo ${OSTYPE}
  # linux-gnu
  echo ${OSTYPE/-/_}
  # linux_gnu

  echo ${OSTYPE%-gnu}
  echo ${OSTYPE%-*}
  # linux

parameter substitutions ${-=?+}

  echo ${OS:=unix}

@tag: [[bash]] [[sh]]


==== GNU make ====

  ${SRCS:.cpp=.o}


==== grep / sed ====

  echo " match \"what\" is \"inside quotes\" only " | grep -o '"[^\"]*"'

  echo " match \"what\" is \"inside quotes\" only " | sed 's/"[^\"]*"/\n&\n/g' | grep  ^\"
  "what"
  "inside quotes"


==== EDITOR ====

EmacS

http://www.gnu.org/software/libtool/manual/emacs/Regexp-Replace.html

  M-x replace-regex
  mailto:.*@\(.*\) 
  host:\1

  \[.*\] []

Vi:


Replace ^M in vim  :
  %s/\r//g

==== [[Perl]] ====

  * http://www.perl.com/doc/manual/html/pod/perlre.html


==== [[PHP]] ====

  $html='<img src="foo" >';
  preg_match_all("|<img src=\"([^\"]*)\".*|", $html , $url );
  print_r( $url );
  print ( "url=" . $url[1][0] . "\n" ); // url=foo

  eregi("MSIE", $HTTP_USER_AGENT);


==== [[Python]] ====

  * http://www.diveintopython.org/regular_expressions/street_addresses.html


==== Ruby ====


thx to pok

<code>
#!/usr/bin/env ruby

puts ABOUT = "There are my git repositories"
puts "=" * ABOUT.size
puts
puts "[in #{HERE = File.dirname(__FILE__)}]"
puts

Dir["#{HERE}/**/.git"].each do |g| 
  puts "* #{g.gsub(%r{^#{HERE}/}, '').gsub(%r{/\.git$}, '')}"
end

puts

</code>


==== Java ====

  s="a\n\r\n\rb\r\r\rc\n\n\rd";
  document.write("#s=\""+s+"\"");
  m=/\r+/g; 
  r="\n"; 
  s=s.replace(m,r); 
  r="_";
  m=/\n+/g; 
  s=s.replace(m,r); 


==== [[Software]] ====

  * http://www.ex-parrot.com/~pdw/Mail-RFC822-Address.html
  * http://www.regexlib.com/REDetails.aspx?regexp_id=711
  * http://www.weitz.de/regex-coach/#install [[ClosedSource]] [[Linux]] [[Windows]]

  ed2k://|file|regex-coach.tgz|2505734|599b0466ada8e0f4361f3d7d8d85f249|


==== ini ====

  # function to parse ini file (backup.ini)
  #
  # $1 -> file.ini
  # $2 -> section
  _parse_ini () {
     if [ -z "$1" ] || [ -z "$2" ]; then return 0; fi
     eval `cat $1 | \
        sed -e 's/[[:space:]]*\=[[:space:]]*/=/g' \
        -e 's/;.*$//' \
        -e 's/[[:space:]]*$//' \
        -e 's/^[[:space:]]*//' \
        -e "s/^\(.*\)=\([^\"']*\)$/\1=\"\2\"/" | \
        sed -n -e "/^\[$2\]/,/^\s*\[/{/^[^;].*\=.*/p;}"`
 }


==== Misc ====

  * http://packages.qa.debian.org/r/rpl.html
  * http://www.amk.ca/python/howto/regex/
  * http://sitescooper.org/tao_regexps.html
  * http://www.english.uga.edu/humcomp/perl/regex2a.html
  * http://www.english.uga.edu/humcomp/perl/regexps.html
  * http://www.english.uga.edu/humcomp/perl/regular_expressions.HTML
  * http://www.english.uga.edu/humcomp/perl/
  * http://java.sun.com/docs/books/tutorial/extra/regex/
  * http://gnosis.cx/publish/programming/regular_expressions.html
  * http://www.zvon.org/other/PerlTutorial/Books/Book1/
  * http://it.metr.ou.edu/regex/
  * http://www.regular-expressions.info/
  * http://matt.might.net/articles/sculpting-text/




===== MORE =====

@TaG: [[regular]] [[expression]] [[Perl]] [[Unix]] [[Shell]] [[VI]] [[bash]] [[sed]] [[awk]] [[php]] 

{{http://imgs.xkcd.com/comics/regular_expressions.png}}