Simple JavaScript Regular Expression

Question

I'm sure this is really simple but I haven't been able to create one that works.

I need a regular expression to extract a one or two digit number 1-13 from a string such as "(11)" or "(3)"

Thanks :)

What have you tried? Good source for regular expressions: regular-expressions.info — Felix Kling
– Felix Kling, Commented Jul 20, 2011 at 20:58

Tim Pietzcker · Accepted Answer · 2011-07-20 20:56:13Z

3

result = subject.match(/\b(?:1[0-3]|0?[1-9])\b/);

will match a two digit number between 1 and 13, wherever it may be (as long as it's not part of a longer number or within a word).

If you want to hard-code the parentheses, it's

result = subject.match(/\((?:1[0-3]|0?[1-9])\)/);

and if you want to find more than one match in a single string, use the g modifier (after the last slash).

answered Jul 20, 2011 at 20:51

Tim Pietzcker

337k59 gold badges520 silver badges572 bronze badges

Sign up to request clarification or add additional context in comments.

1 Comment

Thanks! I am using the first one.

ngn · Accepted Answer · 2011-07-20 21:02:46Z

1

var theNumber = parseInt(theString.replace(/$([1-9]|1[1-3])$/, '$1'));

answered Jul 20, 2011 at 21:02

ngn

7,9226 gold badges29 silver badges37 bronze badges