Reputation: 148744

Regex Last occurrence?

I'm trying to catch the last part after the last backslash
I need the \Web_ERP_Assistant (with the \)

My idea was :

C:\Projects\Ensure_Solution\Assistance\App_WebReferences\Web_ERP_WebService\Web_ERP_Assistant


\\.+?(?!\\)      //  I know there is something with negative look -ahead `(?!\\)`

But I can't find it.

[Regexer Demo]

Upvotes: 203

Answers (7)

Katja

Reputation: 867

If you don't want to include the backslash, but only the text after it, try this: ([^\\]+)$ or for unix: ([^\/]+)$

Upvotes: 12

shA.t

Reputation: 16978

I used below regex to get that result also when its finished by a \

(\\[^\\]+)\\?$

[Regex Demo]

Upvotes: 4

Jeeter

Reputation: 6105

One that worked for me was:

.+(\\.+)$

Try it online!

Explanation:

.+     - any character except newline
(      - create a group
 \\.+   - match a backslash, and any characters after it
)      - end group
$      - this all has to happen at the end of the string

Upvotes: 142

TimE

Reputation: 2887

A negative look ahead is a correct answer, but it can be written more cleanly like:

(\\)(?!.*\\)

This looks for an occurrence of \ and then in a check that does not get matched, it looks for any number of characters followed by the character you don't want to see after it. Because it's negative, it only matches if it does not find a match.

Upvotes: 68