if ($string =~/^(?:Ext|\d|\)|\(|\.|\s|\+\-)+$/i)

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It fails to match with a leading +, which I haven't got to the bottom of yet, but rejects all the wrong strings.
It only accepts the pair "+-", not individual +'s or -'s. Easier with a character class: 
if ($string =~/^(?:Ext|[-.+()\d\s])+$/i)

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In reply to Re^4: Tweak for my Perl Regex that screens for digits only by ysth
in thread Tweak for my Perl Regex that screens for digits only by hackermike

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