Re: Confusing syntax error with grep

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 )
[download]

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

Ron Steinke
<rsteinke@w-link.net>

Comment on Re: Confusing syntax error with grep Download Code

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Re^2: Confusing syntax error with grep by ikegami (Patriarch) on Aug 12, 2004 at 15:36 UTC
No, that would only be the case if the (last set of) parens weren't there.	[reply]
Re^3: Confusing syntax error with grep by gumpu (Friar) on Aug 12, 2004 at 16:07 UTC
Nope he is correct, it was a problem with 'and' having lower precedence than ',' `grep ( ( expression) and ( expression) and ( expression ) , @files )` [download] Is interpreted as `grep ( ( expression) and ( expression) and ( ( expression ) , @files ) + )` [download] According to `perldoc -f grep`, the construct `grep( expression, list )` is allowed. But it is indeed confusing to man and machine!. Have Fun	[reply] [d/l] [select]
Re^4: Confusing syntax error with grep by ikegami (Patriarch) on Aug 12, 2004 at 16:16 UTC
The post to which I replied said `... and ( expression , @files )`, not `... and ( expression ) , @files` as you used, so my reply does apply to the post to which I replied.	[reply] [d/l] [select]