Re^3: $` $' in bash??


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Re^3: $` $' in bash??

by Sandy (Curate)

on Jul 21, 2011 at 16:37 UTC ( [id://915925]=note: print w/replies, xml )

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in reply to Re^2: $` $' in bash??
in thread $` $' in bash??

Actually, I never use English, so I am not sure what it is that you are saying.

bad variables??

What is the reason for using ${^PREMATCH} instead of $PREMATCH?

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Re^4: $` $' in bash??
by ikegami (Patriarch) on Jul 21, 2011 at 19:49 UTC

I never use English, so I am not sure what it is that you are saying.

You did in the post to which I replied.

What is the reason for using ${^PREMATCH} instead of $PREMATCH?

Quote perlre: "Once Perl sees that you need one of $& , $` , or $' anywhere in the program, it has to provide them for every pattern match. This may substantially slow your program."

${^PREMATCH} and the like are only set on demand (/p), so Perl doesn't need to preemptively populate it whenever you perform a match.

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