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Posted By

jatkins on 01/21/11


Tagged

regex replace text RegularExpression


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Replace multiple occurrences of a regex with replacements from an array

 / Published in: JavaScript
 

Released into the public domain. needle will be replaced needle.length times with the next chronological item from replacements. needle must be a regex (with the global modifier disabled); to pass a string, escape it and pass as new RegExp(escaped_string). Case sensitive. The commented out code below the main block is an earlier, unnecessarily more complicated version kept for reference.

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  1. function find_replace(needle, haystack, replacements) {
  2. 	if(typeof needle == 'function' && !needle.global) {
  3. 		for(replacement in replacements) {
  4. 			haystack = haystack.replace(needle, replacements[replacement]);
  5. 		}
  6. 		return haystack;
  7. 	}
  8. 	else
  9. 		return false;
  10. }
  11.  
  12. /*function find_replace(needle, haystack, replacements) {
  13. 	if(typeof needle=='function') {
  14. 		haystack_remaining = haystack;
  15. 		match   = '';
  16. 		result  = 0;
  17. 		offset  = 0;
  18. 		new_haystack = '';
  19. 		i = 0;
  20. 		while(haystack_remaining && (result = haystack_remaining.search(needle)) != -1) {
  21. 			match = haystack_remaining.match(needle);
  22. 			match = match[0];
  23. 			haystack_remaining = haystack_remaining.substring(result + match.length);
  24. 			new_haystack += haystack.substring(offset, result + offset) + replacements[i];
  25. 			offset += result + match.length;
  26. 			i++;
  27. 		}
  28. 		return new_haystack + haystack.substring(offset);
  29. 	}
  30. 	else
  31. 		return false;
  32. }*/

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