Python中的正则表达式如何查找成对单词

Question

I'm doing the cipher for python. I'm confused on how to use Regular Expression to find a paired word in a text dictionary.

For example, there is dictionary.txt with many English words in it. I need to find word paired with "th" at the beginning. Like they, them, the, their .....

What kind of Regular Expression should I use to find "th" at the beginning?

Thank you!

Answer 1

如果您有一个单词列表（因此每个单词都是一个字符串），那么您会找到以“ th”开头的单词：

yourRegEx = re.compile(r'^th\w*') # ^ for beginning of string

Answer 2

^(th\\w*)

gives you all results where the string begins with th . If there is more than one word in the string you will only get the first.

(^|\\s)(th\\w*)

wil give you all the words begining with th even if there is more than one word begining with th

Answer 3

(th)\w*

notice you have this great online tool to generate python code and test regex:

REGEX WEBSITE