"C" is correct
For me there are some codification error in the page that greek chars are shown.
The correct question is:
Which regular expression matches "color" and "colour"?
A . colo?ur
B . col[08]+our
C . colou?r
D . col[09]+our
The correct answer is A. colo?ur.
The regular expression "colo?ur" matches both "color" and "colour." Here's the breakdown of the regular expression:
"col" matches the characters "col" literally.
"o?" makes the "o" character optional. It matches zero or one occurrence of the preceding character, which in this case is "o."
"ur" matches the characters "ur" literally.
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