What are regular expressions (RE)?

1.	What are regular expressions (RE)?
Answer» Regular expressions are a specially encoded SEQUENCE of characters that helps PROGRAMMERS in defining a search pattern within the strings. They began to appear in the mid-1940s for describing regular languages. But gradually by the 1970s, they began to pop up in the programming world for searching and pattern-matching. There are numerous applications of regular expressions. Some practical day-to-day aspects are in data science, data extraction, data pre-processing, pattern matching, NATURAL language processing (NLP), web scraping, etc. e.g.: $s = "Gaurav Roy"; if ($s =~ m[Gaurav]) { PRINT "Match Found\n"; } else { print "Match Not Found\n"; }

Answer»

Regular expressions are a specially encoded SEQUENCE of characters that helps PROGRAMMERS in defining a search pattern within the strings. They began to appear in the mid-1940s for describing regular languages. But gradually by the 1970s, they began to pop up in the programming world for searching and pattern-matching. There are numerous applications of regular expressions. Some practical day-to-day aspects are in data science, data extraction, data pre-processing, pattern matching, NATURAL language processing (NLP), web scraping, etc.

e.g.:

$s = "Gaurav Roy"; if ($s =~ m[Gaurav]) { PRINT "Match Found\n"; } else { print "Match Not Found\n"; }

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