Extracting text before forward slash (/) in QGIS?
QGIS' regex engine doesn't support non greedy matches (yet), so it'll always return the longest possible match. Try
regexp_substr( "NAME", '^[^/]+')
That should return all characters from the start of the string which aren't /s.
This turns out to be doable without using the regex_substr function. Instead the code
left( "Name", strpos( "Name" ,'/'))`
can be used instead. It works by identifying the string position of the first
/ and then extracting the text to the left of that position.
If anyone has any suggestions regarding regex_substr I'd still like to see them though.
Not sure where in QGIS you want this feature work. If In the field calculator you may define a custom function based on the Python function
This image shows the basic definition of such a function.
split('/') always returns the text before the first occurrence of '/' or the complete string, if no '/' is found.
You can use this new function like this: