JavaScript regular expression case insensitivity

Question

Please look this JsFiddle.

var target = "Thanks For Looking This Problem";
var phrase = ["anks", "for", "king T"];

for(var indx = 0; indx < phrase.length; indx ++)
{
  target = target.replace(new RegExp(phrase[indx], "gi"), "~~~" + phrase[indx]+ "```");
}

I get this output: Th~~~anks``` ~~~for``` Loo~~~king T```his Problem

But I need this output: Th~~~anks``` ~~~For``` Loo~~~king T```his Problem

'For' instead of 'for'

Bergi · Accepted Answer · 2012-08-22 10:06:51Z

2

Just don't replace by the phrase, but by the matched string:

… target.replace(new RegExp(phrase[indx], "gi"), "~~~$&```");

With that, you might as well remove the loop and use only

return target.replace(new RegExp(phrase.join("|"), "gi"), "~~~$&```")

answered Aug 22, 2012 at 10:06

Bergi

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2 Comments

Sathya Over a year ago

thanks. any good tutorial to learn regular expression. because i couldn't find your method in google search.

Bergi Over a year ago

The linked docs explains about the replace syntax. To learn using Regexes in JS, you might read MDN's guide, to learn regular expression syntax (and lot more) go with regular-expressions.info

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