How To Catch if in all possible case?

Question

I wish to find a regex which matches all combination of the word if. So the valid ones are :

iF, IF , If and if

I have a regex here: [iIfF]*

Eventhough it is matching what I want, it is matching the word Fi and other such combinations too.

Where I'm making the mistake?

Answer 1

Since you seem to be using Java, you'd want:

Pattern p = Pattern.compile("if", Pattern.CASE_INSENSITIVE);

Answer 2

[iI][fF]

Everything in the brackets in any combination will be allowed.

EDIT Java allows for case insensitive RegEx

"(?i)if"

would suffice