How can I match a pattern in regex that can contain anything (letters,numbers,...) but match only if it contains an underscore?
How can I match a pattern in regex that can contain anything (letters,numbers,...) but matches only if it contains an un开发者_开发技巧derscore?
Basically I want to match bob_hello but not bobhello.
This seems pretty much like a homework question, so I'm not going to just give you the answer.
But, what you need to do is this:
Write a three part regular expression:
- First match any sequence of characters from the start of the string except '_'
- Then match exactly '_'
- Then match anything else, to the end of the string
There are other ways, of course - but this will work.
If you want to match everything, ^.*_.*$
will do it. If you just want to test if the string contains a _, _
will be enough.
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