Type of compiled regex object in python

by

Since Python 3.7, you can use re.Pattern. At the time of writing, this is however undocumented: the re module doesn’t advertise that it exports the class, only the typing module mentions its existence (note that the documentation directly mentions functions like “re.findall”, but starts documenting Pattern’s methods with “Pattern.search”, not adding re. and not mentioning that Pattern is a class).

For older Python versions, see below:

Python 3.5 introduced the typing module. Included therein is typing.Pattern, a _TypeAlias.

Starting with Python 3.6, you can simply do:

from typing import Pattern

my_re = re.compile('foo')
assert isinstance(my_re, Pattern)

In 3.5, there used to be a bug requiring you to do this:

assert issubclass(type(my_re), Pattern)

Which isn’t guaranteed to work according to the documentation and test suite.

More Related Contents:

  1. How to use a variable inside a regular expression?
  2. Match a whole word in a string using dynamic regex
  3. How to check for valid email address? [duplicate]
  4. Case insensitive regular expression without re.compile?
  5. Python string.replace regular expression [duplicate]
  6. Split a string at uppercase letters
  7. Regex matching 5-digit substrings not enclosed with digits
  8. How to split but ignore separators in quoted strings, in python?
  9. Python regex match OR operator
  10. What is the best (idiomatic) way to check the type of a Python variable? [duplicate]
  11. Regular expression to extract URL from an HTML link
  12. BeautifulSoup – search by text inside a tag
  13. Get the string within brackets in Python
  14. Python sum, why not strings? [closed]
  15. Regex for existence of some words whose order doesn’t matter
  16. Split string based on a regular expression
  17. Split string on commas but ignore commas within double-quotes?
  18. Python regex: splitting on pattern match that is an empty string
  19. How to compare type of an object in Python?
  20. How to remove symbols from a string with Python? [duplicate]
  21. Python – Locating the position of a regex match in a string?
  22. How to find and replace nth occurrence of word in a sentence using python regular expression?
  23. Python unicode regular expression matching failing with some unicode characters -bug or mistake?
  24. How to split a string by commas positioned outside of parenthesis?
  25. Python regex split without empty string
  26. Creating a custom categorized corpus in NLTK and Python
  27. Warning raised by inserting 4-byte unicode to mysql
  28. Python: Replace with regex
  29. re.split() gives empty elements in list
  30. Issue with regex backreference in Python

Leave a Comment