C# RegEx: Ignore case... in pattern?

Question

I'm using System.Text.RegularExpressions.Regex.IsMatch(testString, regexPattern) to do some searches in strings.

Is there a way to specify in the regexPattern string that the pattern should ignore case? (I.e. without using Regex.IsMatch(testString, regexPattern, RegexOptions.IgnoreCase))

Answer 1

(?i) within the pattern begins case-insensitive matching, (?-i) ends it. That is,

(?i)foo(?-i)bar

matches FOObar but not fooBAR.

EDIT: I should have said (?-i) begins case-sensitive matching - if you just want the whole pattern to be case-insensitive then you don't need to "end" the (?i).