Where as some languages like C, C++, and Python, support regular expressions through extension libraries. Many programming languages include support for regular expressions in the language syntax (Perl, Ruby, etc). Regular expressions are typically used in many applications that involve a lot of text processing. In this, we will learn the basics of regular expressions in Python. The term “regular expressions” is frequently shortened to “regex” at some places. They are strings in which “what to match” is defined or written. We use these patterns in a string-searching algorithm to “find” or “find and replace” on strings. The regular expression metacharacter called Kleene Star(*) is named after him.Ī Python regular expression is a sequence of metacharacters, that defines a search pattern. Until in the 1950s, an American mathematician named Stephen Kleene invented Regular Expressions which entirely revolutionized text processing, pattern matching, and bulk data manipulation. Matching text patterns in a bulk-sized file was an extremely difficult task at that time. There were no standards or pattern matching characters designed at that time. In the early days of computing, text processing and text pattern matching was a huge challenge.
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