Wrapping legend text in QGIS MapComposer at character count

Question

I want to wrap legend text after a certain amount of characters. Is there an automatic way to do that?
I don't want to enter a character (e.g. *) for each line as described in this post, that is too much work...

Edit: I tried to use an expression, but the button is greyed out...

christoph · Answer

You could use an expression string for your labels:

with_variable( 'column',37,
   if(length(@symbol_label) > @column,
      regexp_replace(left(@symbol_label,@column),'(.+)([s,;.])([^s,;.]+)$','12n3') + substr(@symbol_label,@column+1),@symbol_label))

Without expression string:

With expression string:

Wrapping legend text in QGIS MapComposer at character count

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