How can I make a regular expression match upper and lower case?

Question

I don't really know much about regex at all, but if someone could help me change the following code to also allow for lowercase a-z, that would be great!

$("input.code").keyup(function(){ this.value = this.value.match(/[A-Z]{3}([0-9]{1,4})?|[A-Z]{1,3}/)[0]; });

You mean like with /i?

tchrist
– tchrist

2011-09-14 04:20:14 +00:00
Commented Sep 14, 2011 at 4:20 — tchrist
– tchrist, Commented Sep 14, 2011 at 4:20
What are you trying to match? Your regex looks wrong.

NullUserException
– NullUserException

2011-09-14 04:33:58 +00:00
Commented Sep 14, 2011 at 4:33 — NullUserException
– NullUserException, Commented Sep 14, 2011 at 4:33

cheeken · Accepted Answer · 2011-09-14 04:19:40Z

If you want a regular expression to be case-insensitive, add a i modifier to the end of the regex. Like so:

/[A-Z]{3}([0-9]{1,4})?|[A-Z]{1,3}/i

NullUserException · Accepted Answer · 2011-09-14 04:38:55Z

13

/[A-Za-z]{3}([0-9]{1,4})?|[A-Za-z]{1,3}/

[] denotes a character class and A-Z is a allowed range and means ABCDEFGHIJKLMNOPQRSTUVWXYZ. You can extend this easy by adding a-z

edited Sep 14, 2011 at 4:38

NullUserException

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answered Sep 14, 2011 at 4:18

Ben

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3 Comments

Ben Over a year ago

@muntoo probably clashed with my own edit done at the same time adding the other 3 lines.

NullUserException Over a year ago

-1 For suggesting that [a-zA-Z] is equivalent to \w. And why are you using [\w]{3} instead of just \w{3}?

Clare Macrae Over a year ago

\w allows more than [a-zA-Z] - as Regex Cheat Sheet, says it matches in 'Most engines: "word character": ASCII letter, digit or underscore'. Other references are also available....

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