C. Match the preceding qualifier zero or one time.
In regular expressions, the "?" symbol is used as a quantifier to indicate that the preceding element or group should be matched zero or one times. It makes the preceding element or group optional, meaning it can occur either once or not at all.
Here are a few examples to illustrate the usage of the "?" symbol:
Match "colour" or "color":
colou?r
This pattern matches both "colour" and "color." The "?" makes the "u" optional, allowing for both spellings.
A voting comment increases the vote count for the chosen answer by one.
Upvoting a comment with a selected answer will also increase the vote count towards that answer by one.
So if you see a comment that you already agree with, you can upvote it instead of posting a new comment.
Strib
6 months, 4 weeks agoBorbz
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