Python 3.6正则表达式匹配意外结果

Question

我正在使用一个简单的正则表达式来尝试将字符串分类为与权利（工资）或其他相关的字符串。

我已经在regex101.com中测试了正则表达式，它似乎按预期工作但是当我运行代码时，我得到一些奇怪的结果

import re

wages_regx = re.compile(r" pay | payment | salary | salaries | wages? | rates? | hourly rates? | allowances? | penalties | penalty | overtime | under payments? | over payments? | entitlements? ", re.I)

def classify(string):
    if wages_regx.match(string):
        return 'Entitlements'
    else:
        return 'Other'

测试

classify('I have an question about my wages rate.') 
# Returns: Other (Should return Entitlements) should match on (wages? and rates?)

classify(' wages ') 
# Returns Entitlements as expected

classify('ras wages c') 
# Returns Other (Should return Entitlements)

classify(' wages c') 
# Returns Entitlements as expected