Regular Expressions 101

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/
(?!(EGG SHAPED{1}))
/
gm
Negative Lookahead
(?!(EGG SHAPED{1}))
Assert that the Regex below does not match
1st Capturing Group
(EGG SHAPED{1})
EGG SHAPE
matches the characters EGG SHAPE literally (case sensitive)
D
matches the character D with index 6810 (4416 or 1048) literally (case sensitive)
Global pattern flags
g modifier: global. All matches (don't return after first match)
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
Your regular expression does not match the subject string.Try launching the debugger to find out why.

Regular Expression
No Match

/
/
gm

Test String