How to write a regular expression to match either a or b in Python?
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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.
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Special Character Classes.
Sr.No. Example & Description
6 \w Match a single word character: [A-Za-z0-9_]
7 \W Match a nonword character: [^A-Za-z0-9_]
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