Question

I have a input field with this name:

myinput[something][etc]

How can I get the contents from the last [] part from it? i.e. etc in this case?

Answer 1

You can use a regular expression to match whatever is in between the last pair of []. Because [ and ] have special meaning in regexp (they are used to delimit character classes), you have to escape them with \. The entire match (aside from the [ and the ]) is anchored at the end of the string using $.

var s = 'myinput[something][etc]',
    re = /\[([^\]]*)\]$/
    text = re.exec(s)[1]; // "etc"