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Old 11-18-2017, 07:33 AM   #2
Faraone
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A regular expression (regex or regexp for short) is a special text string for describing a search pattern. You can think of regular expressions as wildcards on steroids. You are probably familiar with wildcard notations such as *.txt to find all text files in a file manager. The regex equivalent is ^.*\.txt$.
you can visit this site
https://www.regular-expressions.info/
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Old 11-18-2017, 10:14 PM   #3
AmandaCherry
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A regular expression, regex or regexp (sometimes called a rational expression) is, in theoretical computer science and formal language theory, a sequence of characters that define a search pattern. Usually this pattern is then used by string searching algorithms for "find" or "find and replace" operations on strings.
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