Another RegEx Problem

[Andrew Dixon]

Hi Everyone.

Ok I have a problem getting the following regex to work in Java.

<script[^>]*>(.|\r|\n)+?</script>

It works fine in EditPad Pro but in Java it causes the following error
message when ran:-

'Exception in thread "main" java.lang.Stack OverflowError'

Any ideas why?

Best Regards
[color=blue][color=green][color=darkred]
>>> Andrew Dixon[/color][/color][/color]

[hiwa]

Re: Another RegEx Problem

"Andrew Dixon" <da644_98@NOREP LY.yahoo.co.uk> wrote in message news:<zSTIb.361 7$D83.31729941@ news-text.cableinet. net>...[color=blue]
> Hi Everyone.
>
> Ok I have a problem getting the following regex to work in Java.
>
> <script[^>]*>(.|\r|\n)+?</script>
>
> It works fine in EditPad Pro but in Java it causes the following error
> message when ran:-
>
> 'Exception in thread "main" java.lang.Stack OverflowError'
>
> Any ideas why?
>
> Best Regards
>[color=green][color=darkred]
> >>> Andrew Dixon[/color][/color][/color]

(1)Use MULTILINE flag instead of \r|\n etc.
(2)Use non-capturing-group parenthesizatio n.
(3)Guard against </script> and quotes in the above parens.

[Andrew Dixon]

Re: Another RegEx Problem

Hi.

Sorry, I'm not really understanding what you mean, could you show me an
example or re-write my expression.

Thanks.

--

Best Regards
[color=blue][color=green][color=darkred]
>>> Andrew Dixon[/color][/color][/color]
"hiwa" <HGA03630@nifty .ne.jp> wrote in message
news:6869384d.0 401011625.75288 915@posting.goo gle.com...[color=blue]
> "Andrew Dixon" <da644_98@NOREP LY.yahoo.co.uk> wrote in message[/color]
news:<zSTIb.361 7$D83.31729941@ news-text.cableinet. net>...[color=blue][color=green]
> > Hi Everyone.
> >
> > Ok I have a problem getting the following regex to work in Java.
> >
> > <script[^>]*>(.|\r|\n)+?</script>
> >
> > It works fine in EditPad Pro but in Java it causes the following error
> > message when ran:-
> >
> > 'Exception in thread "main" java.lang.Stack OverflowError'
> >
> > Any ideas why?
> >
> > Best Regards
> >[color=darkred]
> > >>> Andrew Dixon[/color][/color]
>
> (1)Use MULTILINE flag instead of \r|\n etc.
> (2)Use non-capturing-group parenthesizatio n.
> (3)Guard against </script> and quotes in the above parens.[/color]

[hiwa]

Re: Another RegEx Problem

"Andrew Dixon" <da644_98@NOREP LY.yahoo.co.uk> wrote in message news:<mcaJb.752 7$M42.20@news-binary.blueyond er.co.uk>...[color=blue]
> Hi.
>
> Sorry, I'm not really understanding what you mean, could you show me an
> example or re-write my expression.[/color]
Here is a simple example. Hope this helps.
<code>
import java.nio.*;
import java.nio.channe ls.*;
import java.io.*;
import java.util.regex .*;

public class TagBodyExtracto r{

public static void main(String[] args){
String tagId, closingTag, inFileName;
boolean bodyOnly;

if (args.length < 1){
System.err.prin tln("USAGE:");
System.err.prin tln("java TagBodyExtracto r filename");
System.err.prin tln("or,");
System.err.prin tln("java TagBodyExtracto r tagtext filename");
System.exit(1);
}

if (args.length == 2){
tagId = args[0];
inFileName = args[1];
}
else{
tagId = "script"; // do to-lower on tags before using this prog
inFileName = args[0];
}
closingTag = "</" + tagId + ">";

bodyOnly = false; //output both tags and their bodies

try{
FileInputStream fis = new FileInputStream (inFileName);
FileChannel fc = fis.getChannel( );
MappedByteBuffe r mbf
= fc.map(FileChan nel.MapMode.REA D_ONLY, 0, fc.size());
byte[] barray = new byte[(int)(fc.size() )];
mbf.get(barray) ;
String str = new String(barray, "US-ASCII");
//or //String str = new String(barray") ; //use default

String match1, match2, match3;
//here we assume syntax-error-free html file!
String regex = "(<" + tagId + "[^>]*>)" //1st capturing group
+ "((?:\"[^\"]*\"|\'[^\']*\'|[^\"\'])*?(?="
+ closingTag + "))" //2nd capturing group
+ "(" + closingTag + ")"; //3rd capturing group
Pattern pat = Pattern.compile (regex, Pattern.DOTALL | Pattern.MULTILI NE);
boolean hasMore = false;
Matcher mat = pat.matcher(str );
while (hasMore = mat.find()){
match1 = mat.group(1);
match2 = mat.group(2);
match3 = mat.group(3);
if (bodyOnly){
System.out.prin tln(match2);
}
else{
System.out.prin tln(match1 + match2 + match3);
}
}
fc.close();
fis.close();
}
catch(Exception e){
e.printStackTra ce();
}
}
}
</code>

[hiwa]

Re: Another RegEx Problem

HGA03630@nifty. ne.jp (hiwa) wrote in message news:<6869384d. 0401021925.4dba 3353@posting.go ogle.com>...

Note: This particular regex string just happens to have no dot '.',
line-head '^' and line-tail '$' regexp operators. So, DOTALL and
MULTILINE flags aren't necessary for this particular case. But
specifying these flags is a good practice when you handle a multi-line
document in a single matcher loop.

[Andrew Dixon]

Re: Another RegEx Problem

Hi.

Thanks, I have it working now.

--

Best Regards
[color=blue][color=green][color=darkred]
>>> Andrew Dixon[/color][/color][/color]
"hiwa" <HGA03630@nifty .ne.jp> wrote in message
news:6869384d.0 401031645.3ad1e b08@posting.goo gle.com...[color=blue]
> HGA03630@nifty. ne.jp (hiwa) wrote in message[/color]
news:<6869384d. 0401021925.4dba 3353@posting.go ogle.com>...[color=blue]
>
> Note: This particular regex string just happens to have no dot '.',
> line-head '^' and line-tail '$' regexp operators. So, DOTALL and
> MULTILINE flags aren't necessary for this particular case. But
> specifying these flags is a good practice when you handle a multi-line
> document in a single matcher loop.[/color]