python-regexHow to match any number with Python regex?

Python regex can be used to match any number. The \d character class can be used to match any digit from 0 to 9. The + quantifier can be used to match one or more digits. The following example code block shows how to match any number with Python regex:

import re

pattern = r"\d+"

string = "There are 12 cats and 15 dogs"

match = re.search(pattern, string)

if match:
    print(match.group())

The output of the example code is:

12

Code explanation

• import re: This imports the re module which provides regular expression matching operations.

• pattern = r"\d+": This defines the regular expression pattern which matches one or more digits.

• string = "There are 12 cats and 15 dogs": This defines the string which will be searched for matches.

• match = re.search(pattern, string): This searches the string for a match to the regular expression pattern.

• if match:: This checks if a match was found.

• print(match.group()): This prints the matched text.

Helpful links

• Python Regular Expressions
• Regular Expression HOWTO

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