python-3.x - 从字符串中获取字符的倒数第二次出现

Question

如何获得字符串中字符的倒数第二个出现？我想用它来aaa获取www.example.com/example/abc/aaa

Answer 1

我喜欢正则表达式：

import re
p = re.compile('a')
all_positions = [oMatch.span() for oMatch in p.finditer(sText)]
second_last_position_span = all_positions[-2]   
second_last_position_start_index = second_last_position_span[0]