RegexdrillBackreference: doubled words
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
A match anywhere counts. Match lines where the same whole word appears twice in a row, separated by one space, like the the.
What this exercise teaches
\b(\w+) \1\b captures a word, then requires a space and the identical text again, with word boundaries on both ends.
A hint if you get stuck
\1 matches the same text that group 1 captured. Use \b so that the and then are not treated as the same word.
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