I am trying to modify the following regular expression, which is for integers either negative or positive. 

$_[0] =~ /^(?:|-|\d+|-\d+)$/

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I'd like the regular expression to also capture floating point values either negative or positive. I thought this would work but it is not. 

$_[0] =~ /^(?:|-|\d+|-\d+|\d+\.\d+|-\d+\.\d+)$/

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In reply to Floating Point/Integer Regular Expression by shortyfw06

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