I'm trying to match a line which has a set pattern but only match it if a particular word doesn't appear in the rest of the line.

If this word  my3.exe appears in the line I wish to skip it.

This is the original code 

if (/my background error (\d+): (.+)/ ) {
   do something with the matched line
}

[download]
This is how I changed it 
if (/my background error (\d+): (.+(?!my3\.exe))/ ) {
   do something with the matched line
}

[download]
It is still however picking up the records that have "my background error" and "my3.exe" in them. Can somebody pinpoint what I am doing wrong ?

In reply to negated word issue by Anonymous Monk

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