如何使用正则表达式从字符串中提取double值.
import re
pattr = re.compile(???)
x = pattr.match("4.5")
我是python正则表达式的新手,并且想知道是否有人可以帮我解决这个问题(我将说明我认为每个位在这里也意味着什么).
谢谢!
RegExp:
r'(^.*def\W*)(\w+)\W*\((.*)\):'
r'...' = python definition of regular expression within the ''
(...) = a regex term
(^. = match the beginning of any character
*def\W* = ???
(\w+) = match any of [a, z] 1 or more times
\W*\ = ? i think its the same as the line above this but from 0+ more times instead of 1 but since it matches the def\W line above (which i dont really know the meaning of) i'm not …