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regex
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Regex is a regular expression, otherwise called - regexes, regex pattern, or regular expression pattern. Regex is a sequence of characters that define a search pattern. Usually, such patterns are used by string-searching algorithms for "find" or "find and replace" operations on strings, or for input validation.

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Regex for checking if Debit Card is valid or not
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Regex for matching words with hyphen and checking if its valid or not
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Regex for checking if username is valid or not
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Regex for checking if port value is in range from 0 to 65535.
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Regex for checking random number is valid or not
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Regex for checking one or more digits number