How to use regular expressions to match numbers in strings in Python

This article is about how to use regular expressions to match the numbers in the string in Python. I think it is very practical, so I share it with you. I hope you can get something after reading this article.

1. Use "\ d +" to match all digits

Code:

Import rezen = "Arizona 479,501,870. Carlifornia 209,213,650." m = re.findall ("\ d +", zen) print (m)

Results:

['479,' 501, '870,' 209, '213,' 650]

However, the above approach also introduces impure data, as shown in the following example:

Import rezen = "Arizona 479,501,870. Carlifornia 209,213,650. String666xxx." m = re.findall ("\ d +", zen) print (m)

Results:

['479', '501', '870', '209', '213', '650', '666']

two。 Use r "\ b\ d +\ b" to match pure numeric data (r represents native characters and has escape)

Code:

Import rezen = "Arizona 479,501,870. Carlifornia 209,213,650. String666xxx." m = re.findall (r "\ b\ d +\ b", zen) print (m)

Results:

['479,' 501, '870,' 209, '213,' 650]

In the first case, it doesn't matter whether there is r at the beginning of the expression, and in the second case, you can only use\ b (representing a pure number with spaces before and after it), otherwise it will only return an empty list.

This is how to use regular expressions to match numbers in strings in Python. The editor believes that there are some knowledge points that we may see or use in our daily work. I hope you can learn more from this article. For more details, please follow the industry information channel.