I believe 'and' actually has a lower operator precedence than the comma operator, so your first expression is parsing as 

( expression ) and ( expression ) and ( expression, @files )

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Try replacing 'and' with '&&' and see if that helps.

Ron Steinke
<rsteinke@w-link.net>

In reply to Re: Confusing syntax error with grep by rsteinke
in thread Confusing syntax error with grep by gumpu

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