Javascript regex to remove anything but numbers from the start of a string

Question

I have some strings like this:

var st1 = 'AU$99.95'; // Should return 99.95

var st2 = 'AU.99.95'; // Should return 99.95

var st1 = 'Blahblah $99,000'; // Should return 99,000

My current regex gets me most of the way there, I'm just using string.replace(/[^0-9.,]/g, "");.

This works for all scenarios except for #2, when there is an allowed character that is before a number. I want to ONLY allow . and , when there is a number preceding it. How can I achieve this?

(I know I can write a javascript function to do this, but I'd rather take care of it all in the one regex replace)

EDIT:

Apologies, small oversight. I also need to remove any text after the number (I assumed before/after numbers wouldn't make a difference, but apparently they do!). So:

var st4 = 'blahblah $.99,000AUD // should return 99,000

@Anirudh Great point. If you make an answer with this updated query I'll mark it as correct. — JVG
– JVG, Commented Jul 24, 2013 at 0:11

akonsu · Accepted Answer · 2013-07-23 14:44:53Z

4

maybe

string.replace(/^[^0-9]*/, "");

answered Jul 23, 2013 at 14:44

akonsu

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1 Comment

David Foerster Over a year ago

This matches the empty prefix and forces a replacement even when the first character is a digit. Use /^[^0-9]+/ to prevent this.

Anirudha · Accepted Answer · 2013-07-24 06:38:17Z

2

You can do this

str.replace(/^[^\d]*/,"").replace(/[^\d]*$/,"");

answered Jul 24, 2013 at 6:38

Anirudha

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