![]() Start with an optional sign (+ or – or nothing).As a start, we can say that a decimal number must obey the following guidelines: To accurately describe what a decimal number should look like, we need to use a split definition. The code for an expression that does all is: / ^ ? ( + \. ![]() This should all be followed by an optional plus or minus sign. Decimal numbers come in all shapes and sizes, and a regular expression that matches all possible permutations might be more complicated than you think.Ī regular expression for a decimal number needs to checks for one or more numeric characters (0-9) at the start of the string, followed by an optional period, and then followed by zero or more numeric characters (0-9).
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