Javascript正则表达式可从字符串开头删除数字以外的任何内容

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

Answer 1

也许

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

Answer 2

你可以这样做

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