#Python
A regular expression 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 expressions are widely used in UNIX world.
The module re provides full support for regular expressions in Python. The re module raises the exception re.error if an error occurs while compiling or using a regular expression.
There are various characters, which would have special meaning when they are used in regular expression.
To avoid any confusion while dealing with regular expressions, we would use r'expression'.
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