What does the regular expression % mean? This article explains in detail through Python regular expression examples

Python regular expressionIn addition to code, symbols such as %^& may also appear in programming. For example: What does the regular expression % mean? What is the Python regular expression pattern and what are the examples? This article will introduce them one by one:
Pattern strings use special syntax to represent a regular expression: letters and numbers represent themselves. A python regular expression pattern matches letters and numbers in the same string. Most letters and numbers have a different meaning when preceded by a backslash. Punctuation marks match themselves only if they are escaped, otherwise they represent a special meaning. The backslash itself needs to be escaped with a backslash. Since regular expressions usually contain backslashes, you're better off using raw strings to represent them. Pattern elements (such as r'\t', equivalent to '\\t') match the corresponding special characters.

The following table lists the special elements in the regular expression pattern syntax. If you use a pattern and provide optional flags arguments, the meaning of some pattern elements will change.

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