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Algorithms and How to Program in Python for Beginners


Python Regular Expressions (RegEx)

This Python regular expressions tutorial will help you understand what are regular expressions and symbols for writing regular expressions along with a demo on how to use these. Regular expressions are a set of characters that helps one identity strings of a specific pattern. The history of regular expressions came from a number of other languages. Now, let us get started and understand how to use the regular expressions along with a demo.

Below topics are explained in this Python regular expressions tutorial:
1. What are regular expressions? (00:15)
2. Symbols for writing regular expressions (01:41)
– $: Specifies that the match must occur at the end of the string
– []: Matches one out all characters within the brackets
– [^..]: Matches anyone characters except those not in the brackets
– .: Represent ss single occurrence of any character except newline
– ?: The preceding character is optional
– ^: Specifies that the match must start at the beginning of the string

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