all Python 3reterm

re

module

Regular expressions: searching, extracting and replacing text by pattern.

Syntax

import re

Write patterns as raw strings r'...', otherwise \b and \d turn into control characters or warnings. match looks only at the start of the string, search looks anywhere, and fullmatch needs the whole string to match; on failure they return None rather than raising. For a simple substring check, in and str.startswith are enough and a regular expression is overkill.

Examples

import re
text = 'order 12, items 7'
print(re.findall(r'\d+', text))  # → ['12', '7']
print(re.match(r'\d+', text))  # → None — match ищет с начала
print(re.search(r'\d+', text).group())  # → 12
print(re.sub(r'\d+', '#', text))  # → order #, items #

See also

Common errors

Open in the full glossarydocs.python.orgReport an inaccuracy