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4. Strong Password Regex Tutorial Strong Password Regex Tutorial

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   # Strong Password Regex Tutorial

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   A regular expression (shortened as regex) is a sequence of characters that specifies a search pattern in text. The patterns are often used by string-search algorithms for "find" or " find and replace" operations or for input validation (i.e if input matches requirement, e.g. if you input a phone that is in fact a phone number and not a name of a country). See more on [wikipedia](https://en.wikipedia.org/wiki/Regular_expression).

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   ## Summary

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