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A question mark in regular expressions is a special character that matches any single character. It is used to match any character in a string, regardless of its position. The question mark is a wildcard character that can be used to match any single character in a string, regardless of its position. For example, the regular expression a?b would match ab, bb, cb, and so on. It would also match any character in between the two letters, such as a1b, a2b, and aXb.
The question mark can also be used to match zero or one occurrence of a character. For example, the regular expression a?b would match b (zero occurrences of the letter a) as well as ab (one occurrence of the letter a). This is useful when you want to match a character that may or may not be present in a string.
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The question mark can also be used in combination with other characters to create more complex regular expressions. For example, the regular expression a?b* would match any string that contains zero or more occurrences of the letter b, preceded by zero or one occurrence of the letter a. This could be used to match strings such as b, ab, bbb, and abbbb.
In summary, the question mark is a special character in regular expressions that can be used to match any single character in a string, regardless of its position. It can also be used to match zero or one occurrence of a character. The question mark can be used in combination with other characters to create more complex regular expressions.