by Sherif Moneim | Python, Reference
Building Blocks
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\d a digit
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\D a non-digit
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\s a whitespace
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\S a non-whitespace
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\w a word
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\W a non-word
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\b a word boundary
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. any character
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\ Escape special char or start a sequence
Repeated Characters or Patterns
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? 0 or 1 time
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+ 0 or more times
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* 1 or more times
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{#} # of times
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{#,} # or more times
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{,#} 0 to # times
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{#, #} # to # of times
Specific Possible Characters
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[xyz] either x, y or z
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[^xyz] Any character besides x, y, or z
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[a-zA-Z] ranges of characters
Location of Characters
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^ beginning of line
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$ end of line
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\A beginning of string
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\z end of string
Capturing
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(...) capture the pattern enclosed
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(...|...) capture either pattern enclosed
