Python Complete Course #-46 Python regular expression (regex) : character classes and quantifier

Python Complete Course #-46 Python regular expression (regex) : identifier and quantifier Character classes distinguish kinds of characters such as, for example, distinguishing between letters and digits. Quantifiers indicate numbers of characters or expressions to match.

reference: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Regular_Expressions/Cheatsheet

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