Hi all,

I have a simple checking like

if (preg_match("/[\w\x2F]{6,}/",$a))

as I would like to allow all "word characters" as mentioned at
http://hu2.php.net/manual/hu/referen...ern.syntax.php
plus the '/' character, and at least 6 characters.

But it throws

Warning: preg_match(): Unknown modifier ']'

and returns false for "abc/de/ggg" which string should be okay.
If I omit the "\x2F", everything works fine but "/" characters are not
allowed. Anyone knows what I'm doing wrong? Maybe "/" characters can not
be put in patterns like this?

Thanks in advance,
Zoltán Németh

# EMAIL REMOVED / 2007-01-19 15:25:38 +0100:
> Hi all,
>
> I have a simple checking like
>
> if (preg_match("/[\w\x2F]{6,}/",$a))
>
> as I would like to allow all "word characters" as mentioned at
> http://hu2.php.net/manual/hu/referen...ern.syntax.php
> plus the '/' character, and at least 6 characters.
>
> But it throws
>
> Warning: preg_match(): Unknown modifier ']'
>
> and returns false for "abc/de/ggg" which string should be okay.
> If I omit the "\x2F", everything works fine but "/" characters are not
> allowed. Anyone knows what I'm doing wrong? Maybe "/" characters can not
> be put in patterns like this?

1. You're making your life harder with those double quotes. \x2F is
interpolated by PHP, before the PCRE library has a chance to see the
string.
2. Use a different delimiter and you'll be able to use slash characters
in the pattern freely.

preg_match('~[\w/]{6,}~', $a);

--
How many Vietnam vets does it take to screw in a light bulb?
You don't know, man. You don't KNOW.
Cause you weren't THERE. http://bash.org/?255991

On p, 2007-01-19 at 15:39 +0000, Roman Neuhauser wrote:
> # EMAIL REMOVED / 2007-01-19 15:25:38 +0100:
> > Hi all,
> >
> > I have a simple checking like
> >
> > if (preg_match("/[\w\x2F]{6,}/",$a))
> >
> > as I would like to allow all "word characters" as mentioned at
> > http://hu2.php.net/manual/hu/referen...ern.syntax.php
> > plus the '/' character, and at least 6 characters.
> >
> > But it throws
> >
> > Warning: preg_match(): Unknown modifier ']'
> >
> > and returns false for "abc/de/ggg" which string should be okay.
> > If I omit the "\x2F", everything works fine but "/" characters are not
> > allowed. Anyone knows what I'm doing wrong? Maybe "/" characters can not
> > be put in patterns like this?
>
> 1. You're making your life harder with those double quotes. \x2F is
> interpolated by PHP, before the PCRE library has a chance to see the
> string.
> 2. Use a different delimiter and you'll be able to use slash characters
> in the pattern freely.
>
> preg_match('~[\w/]{6,}~', $a);
>

Thank you very much, it's working fine now.

Zoltán Németh

Double slash to prevent PHP interpreting the slashes. Also using single
quotes would be a good idea:

if (preg_match('/[\\w\\x2F]{6,}/',$a))


2007/1/19, Németh Zoltán <EMAIL REMOVED>:
>
> Hi all,
>
> I have a simple checking like
>
> if (preg_match("/[\w\x2F]{6,}/",$a))
>
> as I would like to allow all "word characters" as mentioned at
> http://hu2.php.net/manual/hu/referen...ern.syntax.php
> plus the '/' character, and at least 6 characters.
>
> But it throws
>
> Warning: preg_match(): Unknown modifier ']'
>
> and returns false for "abc/de/ggg" which string should be okay.
> If I omit the "\x2F", everything works fine but "/" characters are not
> allowed. Anyone knows what I'm doing wrong? Maybe "/" characters can not
> be put in patterns like this?
>
> Thanks in advance,
> Zoltán Németh
>
> --
> PHP General Mailing List (http://www.php.net/)
> To unsubscribe, visit: http://www.php.net/unsub.php
>
>

Martin Alterisio wrote:
> Double slash to prevent PHP interpreting the slashes. Also using single
> quotes would be a good idea:
>
> if (preg_match('/[\\w\\x2F]{6,}/',$a))
>

Just switching to single quotes would do the trick - you don't need to
escape anything but single quotes, and backslashes if they are the last
character.

Arpad

2007/1/20, Arpad Ray <EMAIL REMOVED>:
>
> Martin Alterisio wrote:
> > Double slash to prevent PHP interpreting the slashes. Also using single
> > quotes would be a good idea:
> >
> > if (preg_match('/[\\w\\x2F]{6,}/',$a))
> >
>
> Just switching to single quotes would do the trick - you don't need to
> escape anything but single quotes, and backslashes if they are the last
> character.
>
> Arpad
>
>
It's true, it works but I still believe is best to do both, since you may
forget to doubleslash when it's imperative for the expression to work, even
when using single quotes.