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Message: [QUOTE="Jason Dusek, post: 4536961"] There is no such function, although you can pretty readily use regexes to do it... It really is too bad that String.to_f does not throw an exception - or at least return NaN - when the string is not a number. A regex that matches the cases where String.to_f will find a value is simple to write, and you can create String.numeric? like so: class String def numeric? not ( self =~ /^[[:digit:]]+(\.[[:digit:]]+)?([eE][[:digit:]]+)?/ or self =~ /^\.[[:digit:]]+([eE][[:digit:]]+)?/ ).nil? end end [/QUOTE]