• kinghajj <kinghajj_member pathlink.com> Jan 30 2005
• "Andrew Fedoniouk" <news terrainformatica.com> Jan 30 2005
• Chris Sauls <Chris_member pathlink.com> Jan 30 2005
• Manfred Nowak <svv1999 hotmail.com> Jan 31 2005

kinghajj <kinghajj_member pathlink.com> writes:

On the Regular Expression "help" guide, it says that "\char" means to match that
"char" literally. However, when I do this, I get a warning similar to this:

undefined escape sequence \{

What do I do?

"Andrew Fedoniouk" <news terrainformatica.com> writes:

 undefined escape sequence \{
 What do I do?


Try to use following sequence

[{]

instead.

I am not sure though will it work or not in this particular implementation.

Andrew Fedoniouk.
http://terrainformatica.com

Chris Sauls <Chris_member pathlink.com> writes:

Out of curiousity, are your regexp's in WYSIWYG strings or escaped (aka
double-quoted) strings?  If using escaped strings, that could be the problem.

-- Chris Sauls

In article <ctk8pt$a54$1 digitaldaemon.com>, kinghajj says...
On the Regular Expression "help" guide, it says that "\char" means to match that
"char" literally. However, when I do this, I get a warning similar to this:

undefined escape sequence \{

What do I do?

Manfred Nowak <svv1999 hotmail.com> writes:

kinghajj wrote: 

[...]
 undefined escape sequence \{
 What do I do?


Seems you want to esacpe the escape character "\" by writing "\\" 
instead.

Because first the lexical phase scans your source into tokens the 
character seqence " \{" is recognized as space followed by the escape 
sequence '\{', which has no meaning to the lexical phase.

But the character sequence " \\{" is recognized as space followed by 
'\\' and '{' from which '\\' is recognized as valid escape sequence 
with the meaning '\'. Therefore the chracters " \{" are passed to the 
RE-programs which then can recognize the "\{" as escaped sequence.

-manfred