Need regex to find last part of input name javascript

Question

I have the following input name:

fw_options[testgradient][background-gradient-start-color]

I need to get the last part of the name:

background-gradient-start-color

I was able to do this with this messy code:

name.replace('][','-').replace(/^[^-]*-/,'').replace(']','').replace('[','');

However, I forgot that the name can also look like this:

fw_options[header_boxstyle][background][background-gradient-start-color]

So, I ended up with the wrong string:

backgroundbackground-gradient-start-color

Can someone please simplify this for me, so that I don't have to use multiple replaces?

I need to get the last part without matching background-gradient-start-color literally, since I have multiple names that I need to find with the same regex.

Wiktor Stribiżew · Accepted Answer · 2015-06-04 22:53:44Z

2

You can extract that with a regex and a capturing group:

\[([^\]]*)\]$

See demo

The value will be in the Group 1.

var re = /\[([^\]]*)\]$/g; 
var str = 'fw_options[testgradient][background-gradient-start-color]';
    
if ((m = re.exec(str)) !== null) {
   document.getElementById("res").innerHTML = m[1];
}

<div id="res"/>

Or a non-regex way with lastIndexOf (crude, without error checking):

var str = "fw_options[testgradient][background-gradient-start-color]";
var ido = str.lastIndexOf("[");
var idc = str.lastIndexOf("]");
alert(str.substring(ido+1,idc));

edited Jun 4, 2015 at 22:53

answered Jun 4, 2015 at 22:48

Wiktor Stribiżew

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1 Comment

Wiktor Stribiżew Over a year ago

My pleasure. Also, I added a non-regex method for completeness.

u.k · Accepted Answer · 2015-06-04 23:02:33Z

1

You could use other tricks as well:

var input = 'fw_options[testgradient][background-gradient-start-color]';
alert(input.replace(/\]/g, '').split(/\[/g).pop());

answered Jun 4, 2015 at 23:02

u.k

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