Question

49

rated 0 times [ 55] [ 6] / answers: 1 / hits: 18447 / 14 Years ago, mon, august 9, 2010, 12:00:00

I wrote a regular expression which I expect should work but it doesn't.

var regex = new RegExp('(?<=[)[0-9]+(?=])')

JavaScript is giving me the error：

Invalid regular expression :(/(?<=[)[0-9]+(?=])/): Invalid group

Does JavaScript not support lookahead or lookbehind?

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2 Years ago

answered 14 Years ago yulissamirandah · Accepted Answer

This should work:

var regex = /[[0-9]+]/;

edit: with a grouping operator to target just the number:

var regex = /[([0-9]+)]/;

With this expression, you could do something like this:

var matches = someStringVar.match(regex);

if (null != matches) {

  var num = matches[1];

}