Regular expression not matching string

Question

I'm trying to figure out the following regular expression:

/^[0-9]{2}-[0-9]{2,3}[a-zA-z]{0,1}/g

In my example.
The following should pass: 00-45, 00-333, 33-333a, 55-34a The following should fail: 33-3333, 22-22dd, 22-2233

Here is my screenshot:

But the once that should fail arent failing. In my javascript code I just do a test:

var regExp = new RegExp(exp);
if(regExp.test(test1))
    alert('pass');
else
    alert('fail');

Is there a way for the regular expression to test the entire string? Example 33-3333 passes because of 33-333, but since there is another 3 I would like it to fail since the fourth 3 would be tested against the character rule?

use ^ and $ to indicate line beginning and ending

Fabricator
– Fabricator

2016-05-06 17:30:26 +00:00
Commented May 6, 2016 at 17:30 — Fabricator
– Fabricator, Commented May 6, 2016 at 17:30
Did you forget glob? - new RegExp(exp, 'g'); ?

Alex K.
– Alex K.

2016-05-06 17:31:38 +00:00
Commented May 6, 2016 at 17:31 — Alex K.
– Alex K., Commented May 6, 2016 at 17:31

anubhava · Accepted Answer · 2016-05-06 17:32:09Z

3

You are missing end anchor $ in your input
A-z inside character class will match unwanted characters as well, you actually need A-Z
{0,1} can be shortened to ?

Try this regex:

/^[0-9]{2}-[0-9]{2,3}[a-zA-Z]?$/

RegEx Demo

answered May 6, 2016 at 17:32

anubhava

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2 Comments

mkHun Over a year ago

You are so speed. :)

adviner Over a year ago

Thanks all, it seems like I forgot the $. I do like your shorter version of removing the last {0,1} for just ?

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