Learning to Program

Ignore Case

Regular expressions are case sensitive by default, but sometimes you don’t care whether text is upper or lower case. You can keep your regular expressions from being case sensitive using the ignore case flag (set with an i, so /ste(?:ph|v)en/gi finds every instance of 'Steven', 'steven', 'Stephen', and 'stephen' in a string). Note how the global flag and the ignore case flag can be (but don’t have to be) used together.