pcre.c : And Operator

[sgane2001]

Hi,
I'm using pcre.c to provide regex support for my application
software. I want to know how to do 'AND' operation in this. I didn't
got any useful info from the net.

Is this operator available or not? If not how could we do this
operation? Any stuffed replies or redirection will be appreciated.

Thanks,
Ganesh

[Gregory Toomey]

sg*******@yahoo .co.in wrote:

Hi,
I'm using pcre.c to provide regex support for my application
software. I want to know how to do 'AND' operation in this. I didn't
got any useful info from the net.

Is this operator available or not? If not how could we do this
operation? Any stuffed replies or redirection will be appreciated.

Thanks,
Ganesh

What on earth is an AND operator in a regular expression?

gtoomey

[sgane2001]

>> What on earth is an AND operator in a regular expression?

If you have an OR ( | ) operator, where is the ( & )

[Gregory Toomey]

sg*******@yahoo .co.in wrote:

What on earth is an AND operator in a regular expression?

If you have an OR ( | ) operator, where is the ( & )

From http://www.perl.com/doc/manual/html/pod/perlre.html
| is alternation

ie [a|b|c]x will match ax or bx or cx

But there is no & as its meaningless. Suppose your could have [a&b&c]x . It
would need to ax and bx and cx simultaneously which is impossible. Its
meaningless.

gtoomey

[sgane2001]

>> would need to ax and bx and cx simultaneously which is

impossible. Its meaningless.

"match ax bx cx". I want to match ax,bx,cx in the string. How can I do
this then. If one of these there is not there then it should print
false.

-Ganesh

[Joona I Palaste]

sg*******@yahoo .co.in scribbled the following:

would need to ax and bx and cx simultaneously which is
impossible. Its meaningless.

"match ax bx cx". I want to match ax,bx,cx in the string. How can I do
this then. If one of these there is not there then it should print
false.

What do you mean by "match ax bx cx" or "match ax,bx,cx"? What
*specific* criterion should the string match?
Do you mean any string that includes *all* of "ax", "bx" and "cx", not
just any one of them? If so, then one very awkward way would be
something like:
(*ax*bx*cx*)|(* ax*cx*bx*)|(*bx *ax*cx*)|(*bx*c x*ax*)|(*cx*ax* bx*)|
(*cx*bx*ax*)
I think there's a shorter way but I can't come up with one now. If
that's not what you want, then what is?

--
/-- Joona Palaste (pa*****@cc.hel sinki.fi) ------------- Finland --------\
\-------------------------------------------------------- rules! --------/
"Shh! The maestro is decomposing!"
- Gary Larson

[Lawrence Kirby]

On Thu, 17 Feb 2005 01:53:22 -0800, sgane2001 wrote:

would need to ax and bx and cx simultaneously which is
impossible. Its meaningless.

"match ax bx cx". I want to match ax,bx,cx in the string. How can I do
this then. If one of these there is not there then it should print
false.

Regular expressions can't do that directly. The simplest way is probaby to
perform 3 separate searches.

Lawrence

[Tim Rentsch]

some incidental interloper responded to someone who wrote:

[Regarding the '&' operator in regular expressions...]

would need to ax and bx and cx simultaneously which is
impossible. Its meaningless.

Forgive me for not responding to the orignal article,
my news server has lost track of it.

The '&' operator isn't meaningless, it means language
intersection. (At least, that's a reasonable guess.)

So, the expression

(a|b|c)&(c|d|e)

would be the same as the expression

c

or, for another example

[a-n]&[i-z]

would be the same as the expression

[i-n]

In these examples only letters are literal characters,
others are all meta-characters.

Can interested parties take this discussion to a newsgroup
more appropriate than comp.lang.c? Thank you.

[CBFalconer]

Lawrence Kirby wrote:

On Thu, 17 Feb 2005 01:53:22 -0800, sgane2001 wrote:

.... snip ...

"match ax bx cx". I want to match ax,bx,cx in the string. How
can I do this then. If one of these there is not there then it
should print false.

Regular expressions can't do that directly. The simplest way is
probaby to perform 3 separate searches.

Factor it. [a|b|c]x

--
"If you want to post a followup via groups.google.c om, don't use
the broken "Reply" link at the bottom of the article. Click on
"show options" at the top of the article, then click on the
"Reply" at the bottom of the article headers." - Keith Thompson

[sgane2001]

Factor it. [a|b|c]x

What I want is, match all the patterns in the given string. I knew that
we can match all the patterns if they are given in order of occurance.
But how to do that in case of un-ordered patterns.

Ex: String ---> "Match the occurances of "match", "this" in this
string"

String =~ /'this' & 'match'/ . How can I do this?