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This message was discovered on ASPFriends.com 'aspngregexp' list.


paul gibbs

Usually you search for an occurance of a specific word or regexp and then
replace it with something else. I wish to search for a NOT occurance of a
word and then do something.

I thought [^word] is what you use, is this correct.

For example :

objRegExp.Pattern = "<a href=http://([^localhost])//(.*?)>"
strResult = objRegExp.Replace (text,"<a href=//test/$2>")

For all occurances of NOT localhost I want to do something, but for the
occurance of the localhost I want to do nothing.

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Darren Neimke
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Reply to this message...
 
    
Wayne King (ASP.NET)
Use a "negative lookahead assertion". This pattern:

http://(?!localhost)\w+/

will match a string that begins with "http://"; that is not followed by
"localhost", but is followed by one or more word characters; followed by
a "/". Specifically, note that the 'do not match' expression,
"(?!localhost)", is an assertion and as such does not consume any
matched text from the input string. The "\w+" expression that follows
it consumes the text up to the "/".

-Wayne
This posting is provided "AS IS" with no warranties, and confers no
rights.

-----Original Message-----
From: paul gibbs [mailto:Click here to reveal e-mail address]=20
Sent: Wednesday, July 17, 2002 7:41 AM
To: aspngregexp
Subject: [aspngregexp] ASPN Reg Expressions

Usually you search for an occurance of a specific word or regexp and
then=20
replace it with something else. I wish to search for a NOT occurance of
a=20
word and then do something.

I thought [^word] is what you use, is this correct.

For example :

objRegExp.Pattern =3D "<a href=3Dhttp://([^localhost])//(.*?)>"
strResult =3D objRegExp.Replace (text,"<a href=3D//test/$2>")

For all occurances of NOT localhost I want to do something, but for the=20
occurance of the localhost I want to do nothing.
Reply to this message...
 
    
Darren Neimke
Wayne... Is this sort of stuff covered in the Perl books written by
Friedl etc. ? I.e.: are they common to version 5 engines or are they
peculiar to .NET Regular Expression engine?

There's obciously a world of difference between our "old" RegEx engine
and the new .NET engine, as is evidenced by things like "negative
lookahead assertions" etc.

Are there any .NET Reg Ex books on the production line that you're aware
of?

Cheers,
Darren

-----Original Message-----
From: Wayne King (ASP.NET) [mailto:Click here to reveal e-mail address]=20
Sent: Thursday, July 18, 2002 10:47 AM
To: aspngregexp
Subject: [aspngregexp] RE: ASPN Reg Expressions

Use a "negative lookahead assertion". This pattern:

http://(?!localhost)\w+/

will match a string that begins with "http://"; that is not followed by
"localhost", but is followed by one or more word characters; followed by
a "/". Specifically, note that the 'do not match' expression,
"(?!localhost)", is an assertion and as such does not consume any
matched text from the input string. The "\w+" expression that follows
it consumes the text up to the "/".

-Wayne
This posting is provided "AS IS" with no warranties, and confers no
rights.

-----Original Message-----
From: paul gibbs [mailto:Click here to reveal e-mail address]=20
Sent: Wednesday, July 17, 2002 7:41 AM
To: aspngregexp
Subject: [aspngregexp] ASPN Reg Expressions

Usually you search for an occurance of a specific word or regexp and
then=20
replace it with something else. I wish to search for a NOT occurance of
a=20
word and then do something.

I thought [^word] is what you use, is this correct.

For example :

objRegExp.Pattern =3D "<a href=3Dhttp://([^localhost])//(.*?)>"
strResult =3D objRegExp.Replace (text,"<a href=3D//test/$2>")

For all occurances of NOT localhost I want to do something, but for the=20
occurance of the localhost I want to do nothing.

| [aspngregexp] member Click here to reveal e-mail address =3D YOUR ID=20
| http://www.asplists.com/asplists/aspngregexp.asp" target="_blank">http://www.asplists.com/asplists/aspngregexp.asp =3D JOIN/QUIT=20
| http://www.asplists.com/search" target="_blank">http://www.asplists.com/search =3D SEARCH Archives
Reply to this message...
 
    
Wayne King (ASP.NET)
Yes, the /Mastering Regular Expressions/ book by Mr. Friedl does cover
many of the advanced features like negative lookahead assertion that
were part of Perl 5. However, the .NET regex engine added some new
features that were not part of Perl, and hence are not covered by that
book.

The .NET Framework SDK docs include information about the features and
constructs supported by the .NET regex engine. The docs provide a basic
description, but you'll probably find you'll need to experiment quite a
bit to really understand some of the new features (I do).

I do not know of any books in production. But, I have heard a rumor
that Mr. Friedl may be working on one that covers the features supported
in .NET.

-Wayne

-----Original Message-----
From: Darren Neimke [mailto:Click here to reveal e-mail address]=20
Sent: Wednesday, July 17, 2002 6:26 PM
To: aspngregexp
Subject: [aspngregexp] RE: ASPN Reg Expressions

Wayne... Is this sort of stuff covered in the Perl books written by
Friedl etc. ? I.e.: are they common to version 5 engines or are they
peculiar to .NET Regular Expression engine?

There's obciously a world of difference between our "old" RegEx engine
and the new .NET engine, as is evidenced by things like "negative
lookahead assertions" etc.

Are there any .NET Reg Ex books on the production line that you're aware
of?

Cheers,
Darren

-----Original Message-----
From: Wayne King (ASP.NET) [mailto:Click here to reveal e-mail address]=20
Sent: Thursday, July 18, 2002 10:47 AM
To: aspngregexp
Subject: [aspngregexp] RE: ASPN Reg Expressions

Use a "negative lookahead assertion". This pattern:

http://(?!localhost)\w+/

will match a string that begins with "http://"; that is not followed by
"localhost", but is followed by one or more word characters; followed by
a "/". Specifically, note that the 'do not match' expression,
"(?!localhost)", is an assertion and as such does not consume any
matched text from the input string. The "\w+" expression that follows
it consumes the text up to the "/".

-Wayne
This posting is provided "AS IS" with no warranties, and confers no
rights.

-----Original Message-----
From: paul gibbs [mailto:Click here to reveal e-mail address]=20
Sent: Wednesday, July 17, 2002 7:41 AM
To: aspngregexp
Subject: [aspngregexp] ASPN Reg Expressions

Usually you search for an occurance of a specific word or regexp and
then=20
replace it with something else. I wish to search for a NOT occurance of
a=20
word and then do something.

I thought [^word] is what you use, is this correct.

For example :

objRegExp.Pattern =3D "<a href=3Dhttp://([^localhost])//(.*?)>"
strResult =3D objRegExp.Replace (text,"<a href=3D//test/$2>")

For all occurances of NOT localhost I want to do something, but for the=20
occurance of the localhost I want to do nothing.
Reply to this message...
 
 




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