检查项目是否与正则表达式字符串匹配

Question

I'm using this script:

import re

message = 'oh, hey there'
matches = ['hi', 'hey', 'hello']

def process(message):
    for item in matches:
        search = re.match(item, message)

    if search == None:
        return False
    return True

print process(message)

Basically, my aim is to check if any part of the message is inside any of the items in matches , however using this script, it always returns False (no match).

Could someone point out if I am doing something wrong in this code?

Answer 1

Use search rather than match . As an optimization, match only starts looking at the beginning of the string, rather than anywhere in it .

Additionally, you're only looking at the result of the last match attempt. You should check inside of the loop and return early if any match:

for item in matches:
    if re.search(item, message):
        return True
return False

Note that if you only care about substrings and don't need to match on regular expressions, just use the in operator :

for item in matches:
    if item in message:
        return True
return False

Answer 2

As icktoofay's answer indicates, you should be using re.search() instead of re.match() if you want to search anywhere in the string, however for something this simple you could use a normal substring test:

message = 'oh, hey there'
matches = ['hi', 'hey', 'hello']

def process(message):
    return any(item in message for item in matches)

print process(message)