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Subject: Re: Trouble with regexp
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> %token FOO_Alter
>
> where 'FOO' is always 'FOO' but 'Alter' is variable.
> I'd like to convert these lines to:
>
>   t_foo_Alter = 'Alter';

Does this work?

%token FOO_\([a-zA-Z]+\)
t_foo_\1 = '\1';