Regex - how can I make my expression case insensitive?

Question

Here's the regex I'm using:

.*?\@(?!yahoo|gmail|hotmail).*

Basically I'm trying to get all non-yahoo/gmail/hotmail email addresses. The above works, however if someone types "ISHOUTATEVERYONE@YAHOO.COM" then it won't match.

I've tried searching around for an answer but nothing working. Is this possible?

I'm trying to use this on a HTML5 Input Pattern attribute:

<input type="email" pattern=".*?\@(?!yahoo|gmail|hotmail).*" title="Email Address (no yahoo, gmail or hotmail)" id="emailaddress" name="emailaddress" required="">

possible duplicate of [Have HTML5's a inputs pattern attribute ignore case](http://stackoverflow.com/questions/5524842/have-html5s-a-inputs-pattern-attribute-ignore-case) — Andrew, Jun 10 '14 at 15:35
You'll have to use `[yY][aA][hH]...` in your pattern, for every alphabet — hjpotter92, Jun 10 '14 at 15:39
Since your check is a little complex, I suggest to delegate this task to javascript that offers a less fastidious way. — Casimir et Hippolyte, Jun 10 '14 at 23:58

score 1 · Accepted Answer · answered Jun 04 '15 at 13:46

1

.*?\@(?![yY][aA][hH][oO][oO]|[gG][mM][aA][iI][lL]|[hH][oO][tT][mM][aA][iI][lL]).*

Thanks to @hjpotter92

answered Jun 04 '15 at 13:46

Jamie Barker

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Regex - how can I make my expression case insensitive?

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