Extract number from string with jquery

Question

I need to extract number from string like

<p id="example">etc etc(5)</p>
<p id="example2">etc etc(-5)</p>

I'm using this code

alert($("#example").text().match(/\((\d+)\)/)[1]);

It's work fine if the number is positive but in the case of a negative number get error

Uncaught TypeError: Cannot read property '1' of null

please help me about that thank's

Amadan · Accepted Answer · 2012-05-15 13:34:47Z

8

Try this:

.match(/\((-?\d+)\)/)[1]

-? says "optional minus".

answered May 15, 2012 at 13:34

Amadan

200k23 gold badges252 silver badges321 bronze badges

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

3 Comments

Cheekysoft Over a year ago

\-? would probably be a safer habit to develop, as the hyphen is a reserved char which is used to specify character ranges inside []

Amadan Over a year ago

@Cheekysoft: I was just answering that question today. The grammar inside [] is very different than outside; I see no reason to pollute one with artifacts of the other.

Cheekysoft Over a year ago

meh, just a question of taste really. I like it when rules can be boiled down to the simpler set, especially when teaching. Personally i find it better to get into the practice of knowing the reserved characters and always quoting them, as it is completely safe to do so. The fact that it is unnecessary doesn't interest me. It's easier to follow the same methodology even if it is strictly "not required". ...But i'm not here to continue a religious war :-) I have at least as much respect for your POV as my own.

Igor · Accepted Answer · 2012-05-15 13:34:23Z

1

Try this instead:

alert($("#example").text().match(/\((-?\d+)\)/)[1]);

That will capture negative numbers as well.

answered May 15, 2012 at 13:34

Igor

34.3k14 gold badges82 silver badges116 bronze badges

Collectives™ on Stack Overflow

Extract number from string with jquery

2 Answers 2

3 Comments

Comments

Your Answer

Linked

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

3 Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Linked

Related