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I dont know why, but I believe is because the formula regex must start and end with the same string. As of version 3.6 all kinds of numbers can have in them, but it cant be first or. Floating point numbers can be in exponent form. Integers include decimal, binary, octal, and hexadecimal forms.

For example, you want to search a word inside a string using regex. All RE module methods accept an optional flags argument that enables various unique features and syntax variations. If you really a regex that will match ALL valid forms of Python numbers, it will be a complex regex. Python regex allows optional flags to specify when using regular expression patterns with match (), search (), and split (), among others. RegEx Module To use RegEx module, python comes with built-in package called re, which we need to work with Regular expression. But seriously, Python numbers are complicated. The first 3 regex works, I test them, but only the 4 regex is skip by Python. Regular expression or Regex is a sequence of characters that is used to check if a string contains the specified search pattern. Python Dictionaries Access Items Change Items Add Items Remove Items Loop Dictionaries Copy Dictionaries Nested Dictionaries Dictionary Methods Dictionary Exercise Python If.Else Python While Loops Python For Loops Python Functions Python Lambda Python Arrays Python Classes/Objects Python Inheritance Python Iterators Python Scope Python Modules Python Dates Python Math Python JSON Python RegEx Python PIP Python Try. In the example above, in the meta description tag, there are 3 keywords that also are in the regex formula: bebeoanamother.