negating entire grouping

"gj" <gjcasimirgmail.com> wrote:
>
>Hi i am wondering if it is possible to negate a grouping
example
>(match) like you do with character classes [^match]
>
>I was thinking of doing it using backreferences but i
found out they
>are not supported with character classes
(match)([^\1])+

You can negate a match -- for example
match(?!this)
Would match "match" "matchsticks"
"matches" but would not match
"matchthis". 
Example: http://tinyurl.com/s5zen

That's only going to negate the text immediately following
the match,
though.  What it sounds like you'll need to do is use a few
preg_matches to
get what you want -- match each table cell, and then run a
second
preg_match on the contents of that match to check and see if
your header is
there.  If it is, add it to the array; if not, move on.

A.

-- 
Remember, no matter where you go, there you are. -Buckaroo
Banzai
Online Regex find/replace utility: http://rereplace.com

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In other words i can sa    (match)(?!\1)+(match)

Match a chunk of text the scan through until you obtain that
same chunk
of text again.


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> Match a chunk of text the scan through until you obtain
that same chunk
> of text again.

Easy:

(match).*?\1

turn on "dot matches newlines" (often called
"single line mode")

Depending on the regex engine and the size of the data
you're working
with, simply finding "match" and then using the
match result in a
literal string search may be faster.

Kind regards,
Jan Goyvaerts
--
http://www.regexbuddy.com/



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Garvin J Casimir wrote:
> Looking at your solution...in theory if you have for
example
>
> match *dot star* match *dot star* match *dot star*
match
>
> won't your example match all occurances of match in
between up until the
> last one??
>

Garvin, u r apparently missing the point in Jan's reex:

(match).*?\1

he's using a LAZY match here , not greedy one:

.*?

so .*? will match everything until the next occurrence of
'match', NOT
the last one.


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> what i am trying to do is a preg_match_all that will 
return an array with
> eatch match plus the contents directly following it
until the next match. so
> the above would be.

That sounds like job for the preg_split function.

A key part of a programmer's skill regarding regular
expressions is to
know when to use a regular expression, and when to use
additional logic
in PHP/whatever.

match.*?match.*?match.*?match.*?match.*?match is going to be
very slow
if your subject string is very long, and contains only 5
occurrences of
"match" (i.e. one too few).  This is the same
situation I explain in
the HTML example at http:
//www.regular-expressions.info/atomic.html

Kind regards,
Jan Goyvaerts
--
http://www.regexbuddy.com/



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we recently discussed matching nested tags here:

http://groups.google.com/group/regex/brow
se_frm/thread/69f90a867d5e7812

it might be of interest to u


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