Did you try to add a word boundary in your regex?

# untested quickshot
$name =~ /^FOO(?!BA[RZ])\b.*$/

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update1: text corrections

update2: please see Hue-Bonds reply to my post for a corrected version

In reply to Re: Zero-width look-ahead regexp question by linuxer
in thread Zero-width look-ahead regexp question by rovf

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