I want to split a text column with city names by selecting only the names like 'world (planet)' and not like 'world planet'. Tried before with left( "Name", strpos( "Name" ,' ')) update existing field and results are fine only for the names 'world (planet)' but the other names like 'world planet' disappeared from column, So tried with conditional function case when 'names'like '%(%' then left( "Name", strpos( "Name" ,'')) end (if this is a correct form of expression). Is there a way to split the names which is included the '()'? (I'm new user in QGIS.)