Question

I’m trying to match a Number in between a set of straight brackets, example:

Match the 0 in actionFields[actionFields][0][data[Report][action]]

This is what I have so far and I keep getting null.

var match, matchRegEx = /^\(?\[(\d)\]\)$/;
nameAttr = "actionFields[actionFields][0][data[Report][action]]", 
match = matchRegEx.exec(nameAttr);

Answer 1

If you look at your regular expression, you’re matching the beginning of the string, zero or one (, then a [, then a \d, then a ], then a ), then the end of the string.

You should just be able to get away with /\[(\d)\]/, unless you’re expecting the [0] construct to show up elsewhere in your string.

Here’s a RegexPal showing this.