子串搜索

>>> import re>>> string = 'test test test test'>>> string.find('test')  # 返回匹配字串的第一个下标0>>> string.rfind('test')  # 返回匹配字串的最后一个下标15>>> [m.start() for m in re.finditer('test', string)]  # 返回所有匹配子串下标[0, 5, 10, 15]

Ref:
http://stackoverflow.com/questions/4664850/find-all-occurrences-of-a-substring-in-python