negate word in reg. expression ?

[riki1512]

Hi,

i use reg. exp. very often, but i would'nt expect that the following would be such a problem: how to negate a whole word ?

i have some files with underscore, file_1, file_2, i'm processing a text to find a file_n following by a keyword:

preg_match ("/file_1.+keyword/", $string, $regs);

But now i have several newlines and there is no rule for theire occurence, so i have to search with

preg_match ("/file_1.+keyword/s");

the problem now is, that in the text

file_1 xyz
file_2 xyz keyword

that matches for file_1 AND file_2, but should only for file_2. I tried to do it with assertions, something like

"file_1" not followed by "file_" keyword<

but it doesn't work, so how can i solve it ? (I can't adjust the string to the right format first because the application stands and works, the reg. exp. are added via configuration-file)

thanks a lot

[mrhappiness]

try m instead of s as modifier

if that won't work try

file_1[^\r\n]+keyword