regex solution in python, just a few lines


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    P
    def isNumber(self, s):
        	pat = [r'^[+|-]?\d*\.?\d+$', r'^[+|-]?\d+\.\d*$', r'^[+|-]?\d*\.?\d+e[+|-]?\d+$', r'^[+|-]?\d+\.?\d*e[+|-]?\d+$']
        	s = s.strip().lower()
        	for p in pat:
        		if re.match(p, s):
        			return True
        	return False
    

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