RegexdrillOptional letter: color or colour
A regex exercise from Regexdrill. Solve it with a pattern box with live highlighting in your browser, checked against hidden test strings, and it is checked the moment you submit.
The task
The whole line must match. Match the American spelling color and the British spelling colour only.
What this exercise teaches
colou?r allows the u to appear once or not at all.
A hint if you get stuck
A question mark makes the character before it optional.
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