What is the use of s { } { }

Hi,

Can any one tell me, whats does the "s { } { }" operator used for in
the below code ?

next unless s{^(\s*\w+\s+$stat_pid\s+(\d+)\s+)\d+\s+.*$pattern$}
{$1};

this is used to search for a existence of the process through ps -ef.

Best Regards,
Subra...

Re: What is the use of s { } { }

On Dec 4, 3:16 pm, Subra wrote:
> Can any one tell me, whats does the "s { } { }" operator used for

see perldoc perlop, section "Regexp Quote-Like Operators", s/PATTERN/
REPLACEMENT/msixpogce

> in the below code ?
>
> next unless s{^(\s*\w+\s+$stat_pid\s+(\d+)\s+)\d+\s+.*$pattern$}
> {$1};

see perldoc perlre

Re: What is the use of s { } { }

Subra wrote:
> Hi,
>
> Can any one tell me, whats does the "s { } { }" operator used for in
> the below code ?

It is the same thing as the much more common "s///", just with different
delimiters.

Xho

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Re: What is the use of s { } { }

Subra wrote:
> Can any one tell me, whats does the "s { } { }" operator used for in
> the below code ?
>
> next unless s{^(\s*\w+\s+$stat_pid\s+(\d+)\s+)\d+\s+.*$pattern$}
> {$1};

It is substitution whatever was matched by the RE
^(\s*\w+\s+$stat_pid\s+(\d+)\s+)\d+\s+.*$pattern$
with the actual text that was matched by
(\s*\w+\s+$stat_pid\s+(\d+)\s+)

In short: it is removing some trailing text.

jue

Re: What is the use of s { } { }

Subra wrote:
> Hi,
>
> Can any one tell me, whats does the "s { } { }" operator used for in
> the below code ?
>
> next unless s{^(\s*\w+\s+$stat_pid\s+(\d+)\s+)\d+\s+.*$pattern$}
> {$1};
>

In RegExp you can use almost any delimiters. Most used are
s/PATERN/REPLACEMENT/;
but when I want to use / somewhere in the regexp then I tend to write it as
s#some/patern#REPLACEMENT#;
This allow me to avoid escaping /. Use basic syntax for example above this
will be write as
s/some\/patern/REPLACEMENT/;

You can use parenthesis too but in this case you must use left and right to
pair these.

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