Re: regular expression question

In article
<1abd8794-b762-400e-9079-4876c603e5e2@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>,
Orson <moleskyca1@xxxxxxxxx> wrote:

Sorry, this is probably silly question, but I cannot find right
answer.

I am trying to use grep -P (for perl regular expressions). I want to
match lines that do not contain the chars "sync".

Does your grep have the '-v' switch ('--invert-match'):

grep -v sync


I thought I could do:

grep -P "[^(sync)]" mytextfile

I understand [] matches any char in the brackets and (sync) groups
those chars together, so I would negate to mean should not match those
chars.

Parentheses group, but not inside brackets. "[^(sync)]" will match any
character other than the 6 listed. In Perl, you would negate the test:

$string !~ /sync/;

but that won't work as an option for grep. My grep doesn't have a '-P'
switch, so I can't tell how to use it. However, the -v switch seems to
do what you want.

--
Jim Gibson

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