Regular Expressions 101

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Function

  • Match
  • Substitution
  • List
  • Unit Tests (7)

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An explanation of your regex will be automatically generated as you type.

Regular Expression

Regex Versions


r"

Delimiters


"
gm

Regex Flags


Unit Tests

given the string [] assert that regex does match
given the string [[1],[3]] assert that regex does match
given the string [[1,2],[3,4]] assert that regex does match
given the string [[01,02],[03,04]] assert that regex does not match
given the string [[]] assert that regex does not match
given the string [ [ 1 , 2 ] , [3, 4] ] assert that regex does match
given the string [ ] assert that regex does match

Tools and Filters



Code Generator

Generated Code

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Please keep in mind that these code samples are automatically generated and are not guaranteed to work. If you find any syntax errors, feel free to submit a bug report. For a full regex reference for Python, please visit: https://docs.python.org/3/library/re.html