Regex Class (Regular Expressions)

[Demetri]

Lets pretend you have a string array and each element is a
sentence. Two of those elements read as follows:

1. The fox escaped from the hound.
2. The fox almost escaped.

Now lets say you loop the string array and inside that
loop you use a Regex class to determine if the current
element matches a certain criteria. The criteria being as
follows:

I want any string which contains the word escaped AND the
word hound in it.

What reg exp pattern would return a positive match on the
element above labled as number 1 ?

[Eric Gunnerson [MS]]

This matches the first one:

escaped.+hound

but you need it in the other order as well, so the one I'd use is:

escaped.+hound| hound.+escaped

--
Eric Gunnerson

Visit the C# product team at http://www.csharp.net
Eric's blog is at http://blogs.gotdotnet.com/ericgu/

This posting is provided "AS IS" with no warranties, and confers no rights.
"Demetri" <Re****@spam.co m> wrote in message
news:00******** *************** *****@phx.gbl.. .

Lets pretend you have a string array and each element is a
sentence. Two of those elements read as follows:

1. The fox escaped from the hound.
2. The fox almost escaped.

Now lets say you loop the string array and inside that
loop you use a Regex class to determine if the current
element matches a certain criteria. The criteria being as
follows:

I want any string which contains the word escaped AND the
word hound in it.

What reg exp pattern would return a positive match on the
element above labled as number 1 ?

[Jon Skeet]

Eric Gunnerson [MS] <er****@online. microsoft.com> wrote:

This matches the first one:

escaped.+hound

but you need it in the other order as well, so the one I'd use is:

escaped.+hound| hound.+escaped

That appears to work fine. I tried to answer this post earlier, but
using the somewhat more clumsy:

^(.*escaped.*ho und.*)|(.*hound .*escaped.*)$

That doesn't work (it doesn't match "Test with escaped then hound in
it") and I don't quite understand why. Any chance you could enlighten
me?

--
Jon Skeet - <sk***@pobox.co m>
http://www.pobox.com/~skeet/
If replying to the group, please do not mail me too

[Christian T.]

If you want the element (string) which contains the word "escaped" AND the
word "hound" in it, then according to your two strings provided, regex
would not return a positive number at all. since neither string has both
words in it.

Cheers,
Christian T. [MSFT]
Visual Studio Update Team

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From: "Demetri" <Re****@spam.co m>
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Subject: Regex Class (Regular Expressions)
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Lets pretend you have a string array and each element is a
sentence. Two of those elements read as follows:

1. The fox escaped from the hound.
2. The fox almost escaped.

Now lets say you loop the string array and inside that
loop you use a Regex class to determine if the current
element matches a certain criteria. The criteria being as
follows:

I want any string which contains the word escaped AND the
word hound in it.

What reg exp pattern would return a positive match on the
element above labled as number 1 ?

[Marcus Andrén]

Jon Skeet <sk***@pobox.co m> wrote in message news:<MP******* *************** **@news.microso ft.com>...

^(.*escaped.*ho und.*)|(.*hound .*escaped.*)$

That doesn't work (it doesn't match "Test with escaped then hound in
it") and I don't quite understand why. Any chance you could enlighten
me?

Possible bug in the .net regex engine? It parsed correctly using a java
applet I found at

http://www.cis.upenn.edu/~matuszek/G...ex-tester.html

Also in the .net regex engine the following regex seems to parse correctly

^(.+escaped.*ho und.*)|(.*hound .*escaped.*)$

The regex probably doesn't really have the meaning you thought it had
though. Misplaced paranthesises causes the regex to match on either
^(.*escaped.*ho und.*) or (.*hound.*escap ed.*)$. Placing the whole matched
string in group 0. Group 1 or 2 will also contain the full string while
the other group will be null since only one of the two paths can be
followed.

^(.*escaped.*ho und.*|.*hound.* escaped.*)$ would make the regexp a little
less complex although this expression also seems to fail in .net regex
engine.

The most practical regex if you want to use ^,$ to match the
whole row is probably

^.*(escaped.*ho und|hound.*esca ped).*$

It places the whole matched row in group 0 and the "escaped.....ho und" in
group 1. This regex does work in the .net regex engine.

/Marcus