These two returns "123"
%%
cac = regexp('ITEM 123', '.+?(\d+)', 'tokens' )
%%
cac = regexp('ITEM 123', '[^\d]+(\d+)', 'tokens' )
First, '.+' matches anything up til the end of the text, next it gives back just as little as needed to match '(\d+)' , which is one digit.
'.+?' matches as little as needed so that '(\d+)' is able to match the following text.
I prefer '[^\d]+(\d+)'
Or why not just
cac = regexp('ITEM 123', '\d+', 'match' )
