Regexp only one dot and digits

Question

I faced some problems with regex; I want to leave only valid numbers in a string, people might enter:

and so on,

str = .replace(/[^[0-9]{1,2}([.][0-9]{1,2})?$]/g, '');

So I need to allow only digits and one dot from anything the user has entered;

This answer however doesn't work when I try to put it in:

str.replace(/(?<=^| )\d+(\.\d+)?(?=$| )|(?<=^| )\.\d+(?=$| )/,'');

It gives me a JS error. Please help me to understand what am I doing wrong.

p.s: thank You all guys for helping me, i found solution HERE, so i think thread may be closed.

What should happen with `abd11` - should it be removed entirely or become `abd`? — Tim Pietzcker, Aug 29 '13 at 14:06
possible duplicate of [Regex matching numbers and decimals](http://stackoverflow.com/questions/10921058/regex-matching-numbers-and-decimals) — Qantas 94 Heavy, Aug 29 '13 at 14:07
From the second expression I see you were trying to remove all floating point numbers from the string ? — Ibrahim Najjar, Aug 29 '13 at 14:09
idealy, "abd11,asd11" must got 1111, but if it will got at least 11, that would be good. — ailmcm, Aug 29 '13 at 14:23
I think you should provide an example text - before and after - with all relevant cases that should or should not be replaced. — Tim Pietzcker, Aug 29 '13 at 14:27
the idea is to left only digits and one single dot (first): i.e: 123dfs3d.123d.341dde will be equal: 1233.123341 — ailmcm, Aug 29 '13 at 14:35
Oh, so you want to take an entire string like `jkhsdfu23987sdfiuh39.98sd98h.8f987l987sdf` and turn it into `2398739.98988987l987`? — Tim Pietzcker, Aug 29 '13 at 15:25
I have checked the solution. But problem is that it doesn't solves problem with 2 numbers after dot. — Roman Losev, Mar 07 '16 at 11:07

score 1 · Answer 1 · answered Aug 29 '13 at 14:06

1

use regex as

\d*[0-9]\.\d*[0-9]

answered Aug 29 '13 at 14:06

Tushar

str = str.replace(/[^\d*[0-9]\.\d*[0-9]]/g, ''); allows 11.11.1 – ailmcm Aug 29 '13 at 14:29
@ailmcm please check once again : its correct even if u r in doubt verify it at http://regexpal.com/ – Tushar Aug 29 '13 at 15:18
How can this be updated to allow for a leading negative sign? e.g. `-1.222` – bbodenmiller Jan 10 '14 at 19:13

score 0 · Answer 2 · answered Aug 29 '13 at 14:11

0

You must use quotes. Like this:

str.replace("/(?<=^| )\d+(\.\d+)?(?=$| )|(?<=^| )\.\d+(?=$| )/",'');

answered Aug 29 '13 at 14:11

Norbert

score 0 · Answer 3 · answered Aug 29 '13 at 14:25

0

How about:

/(?: |^)\d*\.?\d+(?: |$)/

this will match:

12
12.34
.34

answered Aug 29 '13 at 14:25

Toto

3 Answers3