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matches the regex pattern at the start of the string. Otherwise, it returns None. The program checks whether if there is a match. PDF Pack. People also downloaded these PDFs Beginning Regular Expressions Andrew Watt Beginning Regular Expressions Beginning Regular Expressions Andrew Beginning Regular Expressions off the ground at Wrox/Wiley. Chapter 2: Regular Expression Tools and an Approach to Using Them. Regular expressions allow us look for patterns in our data. So far we've been limited to beginning of the string is a ", so our pattern does not match. This book introduces the various parts of the construction of a regular expression pattern, explains what they mean, and walks you through working examplesRegular Expression State. Machine. 1. Match current location in the ^Match the beginning of the line Regular Expression Operators abc… Exact match.