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Re: [PHP] Write multiple backslashes




On Wed, Mar 8, 2017 at 8:40 AM, Danny <mynixmail@xxxxxxxxx> wrote:

> As a matter of interest I got it solved using 8 backslashes ... one would
> think
> that 1 backlash will escape 1 more backlash, but it doesn't. Somehow 8
> backlashes did the job ... don't ask me how ...
>
> $IGNORE_TMP=^(\\\\\\\\*.*\\\\\\\\*)$
>
> Thank you for everyone's input ...
>
> >
> >     I'm no regard expert but don't you have to escape it for each one?
> >     Something like $second_rexexp = "ignore_tmp=^(\\\\*.*\\\\*)$";
> >
> >     I could be way off base though...
> >
> >
> > Yes that's true but only because it is a double quoted string, meaning
> > backslashes are treated as escape sequences.
> >
> > You could also just use a single quoted string.
> >
> > $second_regexp = 'IGNORE_TMP=^(\\*.*\\*)$';
>
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>
You do need 4 slashes for each slash. The way it works is the \\\\ becomes
\\ (PHP escapes each \ with \ before sending it to regular expression) then
regular expression treats \\ as \.

If you were outputting it without sending it to regular expression then \\
would be sufficent.