Last number in string

[aliensite]

How do I get expression to output "24"?

<script>
var str = "dog3cat24z"
var re = /\D/g;
var lastNum = str.replace(re, "") // lastNum should be 24
document.write(lastNum)
</script>

Thanks

 

[Evertjan.]

aliensite wrote on 21 nov 2005 in comp.lang.javascript:

How do I get expression to output "24"?

<script>
var str = "dog3cat24z"
var re = /\D/g;
var lastNum = str.replace(re, "") // lastNum should be 24
document.write(lastNum)
</script>

str = "dog3cat24z"

var lastNum = str.replace(/.*?(\d+)[^\d]*$/,'$1')

alert(lastNum)

 

[Dr John Stockton]

JRS: In article <[email protected]>
, dated Mon, 21 Nov 2005 14:36:08, seen in

How do I get expression to output "24"?

<script>
var str = "dog3cat24z"
var re = /\D/g;
var lastNum = str.replace(re, "") // lastNum should be 24
document.write(lastNum)
</script>

If there is always a non-digit before the last number - and you can
assure that by prepending one -
lastNum = str.replace(/.*\D(\d+)\D*/, "$1")

This might work without that condition, but in fewer browsers -

lastNum = str.replace(/.*?(\d+)\D*/, "$1")

Also

lastNum = str.split(/\D+/).reverse()[0]