What is RegEx? Regular Expression in Python & Meta Characters

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RegEx In Python

• What's the first thing you need to know about
  RegEx? Hold on! 'Cause, that's what we are going
  to explain via this tutorial that will surely
  help to make you understand thoroughly about
  whole regular expressions' concept.

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What is RegEx
A regular expression (regex, regexp or re) is a
special sequence of characters that helps you
match or find other strings or sets of strings,
using a specialized syntax held in a
pattern. Regular expression patterns are
assembled into a set of byte codes which are then
executed by a matching engine written in C
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basic regular expression through the following
image
The caret sign () serves two purposes. Here, in
this figure, its checking for the string that
doesnt contain upper case, lower case, digits,
underscore and space in the strings. In short, we
can say that it is simply matching for special
characters in the given string.
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common usages of regular expressions

• The most common usages of regular expressions
  are
• Search a string (search and match)
• Finding a string (findall)
• Break string into a sub strings (split)
• Replace part of a string (sub)

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The basic usages of commonly used metacharacters
are shown in the following table  
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Regular expression 

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