Click here to Skip to main content
15,568,300 members
Articles / General Programming / Regular Expressions
Tip/Trick
Posted 21 Apr 2014

Stats

29.3K views
14 bookmarked

Javascript Replace All with Case Insensitive Matching

Rate me:
Please Sign up or sign in to vote.
4.88/5 (10 votes)
25 May 2014CPOL
Custom Javascript replaceAll() using prototype with Case Insensitive Matching!

Introduction

I was using the regex replace all, but found out it had errors replacing certain reserved characters without escaping them first. So I wrote a custom method, it seems to work pretty well. Please, help test with internet explorer and windows. Also, please let me know if I have goofed with string pointer positions. I haven't fully tested it yet, but I hope it is flawless. Thanks!

Please speed test it here.
http://jsperf.com/javascript-replace-all/8[^]
http://jsperf.com/javascript-replace-all/10[^]

JavaScript - Prototype Version

JavaScript
// Find, Replace, Case
String.prototype.replaceAll = function(_f, _r, _c){ 

  var o = this.toString();
  var r = '';
  var s = o;
  var b = 0;
  var e = -1;
  if(_c){ _f = _f.toLowerCase(); s = o.toLowerCase(); }

  while((e=s.indexOf(_f)) > -1)
  {
    r += o.substring(b, b+e) + _r;
    s = s.substring(e+_f.length, s.length);
    b += e+_f.length;
  }

  // Add Leftover
  if(s.length>0){ r+=o.substring(o.length-s.length, o.length); }

  // Return New String
  return r;
};
//
How to use:
JavaScript
// Replaces Case Matching - Param = FindString, ReplaceString, ICaseBoolean 
'Test to see if this works? (Yes|No)'.replaceAll('(Yes|No)', 'Yes!');

// Replaces Case Insensitive Matching with True
'Test to see if this works? (Yes|No)'.replaceAll('(yes|no)', 'Yes!', true);

JavaScript - Direct Function Version

JavaScript
function replaceAll(_s, _f, _r, _c){ 

  var o = _s.toString();
  var r = '';
  var s = o;
  var b = 0;
  var e = -1;
  if(_c){ _f = _f.toLowerCase(); s = o.toLowerCase(); }

  while((e=s.indexOf(_f)) > -1)
  {
    r += o.substring(b, b+e) + _r;
    s = s.substring(e+_f.length, s.length);
    b += e+_f.length;
  }

  // Add Leftover
  if(s.length>0){ r+=o.substring(o.length-s.length, o.length); }

  // Return New String
  return r;
}
How to use:
JavaScript
// Replaces Case Matching - Results = replaceAll(FindString, ReplaceString, ICaseBoolean) 
replaceAll('Test to see if this works? (Yes|No)', '(Yes|No)', 'Yes!');

// Replaces Case Insensitive Matching with True
replaceAll('Test to see if this works? (Yes|No)', '(yes|no)', 'Yes!', true);

PHP - Direct Function Version

PHP
function replaceAll($_s, $_f, $_r, $_c=false)
{ 
  $o = $_s;
  $r = '';
  $s = $o;
  $b = 0;
  $e = -1;
  if($_c){ $_f = strtolower($_f); $s = strtolower($o); }

  while(($e=strpos($s, $_f))!=false)
  {
    $r .= substr($o, $b, ($b + $e)) . $_r;
    $s = substr($s, ($e + strlen($_f)), strlen($s));
    $b += $e + strlen($_f);
  }

  // Add Leftover
  if(strlen($s)>0){ $r.=substr($o, (strlen($o) - strlen($s)), strlen($o)); }

  // Return New String
  return $r;
}
How to use:
JavaScript
// Replaces Case Matching - Results = replaceAll(FindString, ReplaceString, ICaseBoolean) 
replaceAll('Test to see if this works? (Yes|No)', '(Yes|No)', 'Yes!');

// Replaces Case Insensitive Matching with True
replaceAll('Test to see if this works? (Yes|No)', '(yes|no)', 'Yes!', true);

Javascript - Prototype REGEX Version

DO NOT USE! HAS ISSUES WITH CHARACTERS!
JavaScript
/* DO NOT USE - Regex has issues replacing reserved characters unless they are escaped. Found out the hard way! */
String.prototype.replaceAll = function()
{ 
  return this.toString().replace(new RegExp(arguments[0], 'g' +
 ((arguments[2])? 'i': '') ), arguments[1]); 
};

License

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


Written By
Software Developer (Senior) Codevendor
United States United States
Please visit my personal website https://codevendor.com for my latest codes and updates.

Comments and Discussions

 
GeneralMy vote of 5 Pin
Anurag Gandhi27-Apr-14 6:21
professionalAnurag Gandhi27-Apr-14 6:21 
GeneralMy vote of 4 Pin
Nitij24-Apr-14 3:35
professionalNitij24-Apr-14 3:35 

General General    News News    Suggestion Suggestion    Question Question    Bug Bug    Answer Answer    Joke Joke    Praise Praise    Rant Rant    Admin Admin   

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.