Issues with Regex evaluation in Javascript

Asked Nov 23 '16 at 08:43

Active Nov 23 '16 at 10:48

Viewed 10 times

My array consists of thousands of values and I need to get the '[State]' string out of it. I use regex for fetching various strings (from the same array) and they all work fine (for instance the following:

'^\/\/[ ]{1}[0-9]{3,4}').

...so in order to get the mentioned '[State]' I created the following Regex:

'^\[State\]'

And it works fine in Regex tester ...but as soon as I pass this regex in my javascript code:

var reg = new RegExp(searchElement);

and then match test it:

if (reg.test(file[el]))

I get other things returned like: [Test]... so obviously something's wrong with the expression. As mentioned other expressions work flawlessly... And I don't understand why it works in the online regex tester and it doesn't in my code...

edited Nov 23 '16 at 10:48

asked Nov 23 '16 at 08:43

tom33pr

1

Once you write it as `'^\\[State\\]'`, and pass to `RegExp` constructor, it will work. – Wiktor Stribiżew Nov 23 '16 at 08:46
Yes! Thanks Wiktor! Why double escape though? – tom33pr Nov 23 '16 at 08:54
http://stackoverflow.com/a/17863158/3832970 – Wiktor Stribiżew Nov 23 '16 at 08:58

Issues with Regex evaluation in Javascript

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