CODEWITHSUNDEEP
regex
John
John

Reputation: 487

javascript regular expression, allow only numbers and commas

Okay, I'm needing some help with a regular expression replace in javascript.

I have this function which takes everying out but numbers.. but I need to allow commas as well.

function validDigits(n){
return n.replace(/\D+/g, '');}

I'm still pretty cloudy on regex syntax, so if anyone could help me out I would greatly appreciate it.

Upvotes: 9

Views: 20621

Answers (3)

heavyrick
heavyrick

Reputation: 394

This code is great, you choose the regex model you want, if the character is not allowed, it's deleted. 

<script type="text/javascript"> 
var r={
'special':/[\W]/g,
'quotes':/['\''&'\"']/g,
'notnumbers':/[^\d]/g,
'notletters':/[A-Za-z]/g,
'numbercomma':/[^\d,]/g,
}

function valid(o,w){
o.value = o.value.replace(r[w],'');
}
</script>

HTML

<input type="text" name="login" onkeyup="valid(this,'numbercomma')" />

Upvotes: 0

Toto
Toto

Reputation: 91373

Use a class characters :

/[^\d,]+/g

Upvotes: 1

mck89
mck89

Reputation: 19231

function validDigits(n){
   return n.replace(/[^\d,]+/g, '');
}

When you use square brackets and a ^ after the open bracket you search for every character that is not one of those between brackets, so if you use this method and search for everything that is not a number or a comma it should work well.

Upvotes: 17

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