正则表达式如何在字符串末尾匹配下划线？

Question

I have following pattern which fails with the underscore at the end but works otherwise

".\\d{1,2}\\.\\d{1,2}_."

EDIT:

so I want all string that look with this:

ANY TEXT HERE 10.20_ ANY TEXT HERE

"Here is a sample 10.20_ that i use."

"10.20_ is another sample."

Answer 1

After the _ there is a . which means one occurrence of a character except line break. So if the _ is at end it will not match the regex. You have not given any examples of what you want, and just the regex, but you may want to make it .\\d{1,2}\\.\\d{1,2}_.?

Answer 2

尝试这个，

^.*\d{1,2}\.\d{1,2}_.*$

Answer 3

Your use of the period in the regex pattern is confusing. It says give me any character, do you want the white space before and possibly after? If so specify as \\s? for both the beginning or the end. If you just want the number simply use:

\d\d?\.\d\d?_

Or am I missing something?