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);
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.
Your regex should be:
\[(\d+)\]
and capture the first group.
One problem with your regex is that it is anchored at the beginning of input (^) and at the end $.
If there's only one number /\d+/
You can test only for the number
\(,\)) but there are none in your string. Why do you have them there? Also, your expression is anchored at the beginning and end, so only strings such as([5])or[3])would be matched.