regex - Python在前瞻性断言中完全匹配

Question

如果用户输入变量单词与字符串a中的完全匹配，则我想检索句子的其余部分。

a = 'hello there, I wanted to find out how to split this document'
word = 'wanted'
context = re.search(r'(?=^{user}$)(.*$)'.format(user=word), a)
context.group(0)

目前，我已经尝试放置锚和$以确保其匹配，但它将返回此错误消息。

AttributeError: 'NoneType' object has no attribute 'group'

当我将下面的代码更改为：

a = 'hello there, I wanted to find out how to split this document'
word = 'wanted'
context = re.search(r'(?={user}$)(.*$)'.format(user=word), a)
context.group(0)

任何提示都将不胜感激！谢谢！！

Answer 1

没有正则表达式的

a = 'hello there, I wanted to find out how to split this document'
word = 'wanted'

if word in a:
    print(a.split(word,1)[1])

带有regex的(使用字界)：

import re
if re.search(r'\b' + word + r'\b', a):
    # print('{0} found'.format(word))
    m = re.search("(?<=" + word + ")(.*)", a)
    print(m.group(0))
else:
    print('{0} not found'.format(word))

产出：

 to find out how to split this document
 to find out how to split this document