JavaScript Regex Ignore Case

Question

I am trying to match a part of the string and it should be NOT case sensitive. I have the following code but I never get the replaced string.

var name = 'Mohammad Azam'
var result = name.replace('/' + searchText + '/gi', "<b>" + searchText + "</b>");

The searchText variable will be "moha" or "mo" or "moh".

How can I get the matching thing in bold tags.

What do you want to replace searchText with? Literal string 'searchText' or something else? — SolutionYogi
– SolutionYogi, Commented Jul 27, 2009 at 1:29

SolutionYogi · Accepted Answer · 2009-07-27 01:43:27Z

23

/pattern/ has meaning when it's put in as a literal, not if you construct string like that. (I am not 100% sure on that.)

Try

var name = 'Mohammad Azam';
var searchText = 'moha';
var result = name.replace(new RegExp('(' + searchText + ')', 'gi'), "<b>$1</b>");
//result is <b>Moha</b>mmad Azam

EDIT:

Added the demo page for the above code.

Demo →

Code

edited Jul 27, 2009 at 1:43

answered Jul 27, 2009 at 1:31

SolutionYogi

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4 Comments

Ian Elliott Over a year ago

You do not have to construct RegExp's with a parenthesis

SolutionYogi Over a year ago

He wants to capture the match and surround it with <b> and </b> tags. You can't do capturing without parenthesis.

Ian Elliott Over a year ago

Yes you can when the search string is identical to the replacement sans surrounding tags.

azamsharp Over a year ago

So, actually I should be sending the Regex object into the replace and not a string when performing these case operations. Thanks a lot man!

meder omuraliev · Accepted Answer · 2009-07-27 01:36:48Z

3

I think you're looking for new RegExp, which creates a dynamic regular expression - what you're trying to do now is match a string ( not a regexp object ) :

var name = 'Mohammad Azam', searchText='moha';

var result = name.replace(new RegExp(searchText, 'gi'), "" + searchText + ""); result

EDIT: Actually, this is probably what you were looking for, nevermind ^

var name = 'Mohammad Azam', searchText='moha';
name.match( new RegExp( searchText , 'gi' ) )[0]
name // "Moha"

edited Jul 27, 2009 at 1:36

answered Jul 27, 2009 at 1:29

meder omuraliev

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1 Comment

meder omuraliev Over a year ago

heh, I confused myself with what you were looking for - let me know if either of those workout.

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