Hi Guys,
I am using C# and jQuery to valid a username with Regex. Just learning :) So far I have
UserName = "[a-zA-Z0-9]";
But this doesn't stop symbols ? How to ensure that no symbols or " . " or " _ " ?
Thanks
+5
A:
That regex says "At least one letter or number" you want "Every character from the start to the end is a letter or number"
"^[a-zA-Z0-9]+$"
David Dorward
2010-05-04 09:01:58
oh great thanks :) wow fast reply! ill try this. thanks so much
Murray
2010-05-04 09:02:28
great! thanks again :))))
Murray
2010-05-04 09:04:57
As an addition, typically usernames are not allowed to start with digits - to ensure this, use `"^[a-zA-Z][a-zA-Z0-9]*$"`.
Péter Török
2010-05-04 09:09:01
And if you want min/max length restrictions: `"^[a-zA-Z][a-zA-Z0-9]{3,9}$"` (min 4 and max 10)
Amarghosh
2010-05-04 09:16:16
so this works ? ^[a-zA-Z0-9]{3,11}$ - for no symbols, min/max 3-11 ?
Murray
2010-05-04 09:21:02
@Gabriel: check that again; Murray removed the separate letter in the front.
Alan Moore
2010-05-04 19:05:04