06 Optional characters

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Goal

Match both color and colour.

A quantifier says how many times the thing before it may appear. The first one is ?: zero or one time — "optional".

It applies only to the character (or group) immediately before it. In colou?r, only the u is optional. The diagram shows it as a path that can skip the box.

Try it

Accept British and American spelling.

Go to the terminal

Hint

/colou?r/ — the ? makes the u optional.

Show a solution

/colou?r/

This interactive environment needs JavaScript. Everything you need to read is on this page, and the solution works the same way for real.

Regex

Starting Regex…