Python 正则表达式：查找给定模式匹配的所有跨度（匹配、开始、结束）

Question

I need to build a list of all matches of a regex in my text along with their start and end positions in it.

While the re.search returns a match object for which I can leverage the match.start and match.end properties, the re.findall seems to only return the list of matched strings but no match objects.

Here is some code to demonstrate:

import re

text = "40 boxed and 25 crates weight 254 pounds and occupy 23 cubic feet."
searchfor = r"(\d+)"

match = re.search(searchfor, text)
if match:
    print(f"Pattern {match.group()} found at {match.start()} until {match.end()}")

matches = re.findall(searchfor, text)

for match in matches:
    # print(f"Pattern {match.group()} found at {match.start()} until {match.end()}")
    print(match)

Thank you for any insight. Happy 2022

Answer 1

re.finditer() is exactly what you're looking for:

matches = re.finditer(searchfor, text)

for match in matches:
    print(f"Pattern {match.group()} found at {match.start()} until {match.end()}")