Re: regexec - chopping a large text string into chunks

Not to put words in Aaron's mouth, but I suspect that when he's using \s

and \S he's looking for whitespace and non-whitespace respectively.

Words put in mouth correctly :-)

Note I was using the following to allow for ignore-case-extended regex:

D REG_ICASEX C const(X'03')
...

rc = regcomp(preg: %trim(pattern): REG_ICASEX);


I also tried using the other constant in that source member (i.e.
REG_EXTENDED) without success.

Thanks for the input Adam,
Aaron Bartell
http://mowyourlawn.com



On Fri, Sep 19, 2008 at 8:10 AM, Adam Glauser <adamglauser@xxxxxxxxxxxx>wrote:

Scott Klement wrote:

pattern = '(\S\S{40,}|.{1,40})(\s+|$)' + x'00';

The next element of the array matches your first subexpression.
Subexpressions are the things in parenthesis. Your first one is
(\S\S{40,}|.{1,40}) -- which means 40 or more of the letter S or 1-40 of
any character.

Not to put words in Aaron's mouth, but I suspect that when he's using \s
and \S he's looking for whitespace and non-whitespace respectively. Do
the C regex APIs support Extended Regular Expression syntax,
specifically the shorthand character classes? [1]

If I'm right about Aaron's intention with \s and \S, then I'm a bit
confused about the '\S\S{40,} part. I think that if the search string
contained 41 or more consecutive non-whitespace characters, that would
be what was matched. I haven't tested this.

HTH,
Adam

[1]

http://en.wikipedia.org/wiki/Regular_expression#POSIX_Extended_Regular_Expressions