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Regex Tester. Regex Tester isn't optimized for mobile devices yet. You can still take a look, but it might be a bit quirky. > Okay! 19 Nov 2011 [1-9][0-9]*|0 ". I'd just use " [0-9]+ " to represent positive whole numbers. This will allow decimal numbers (or whole numbers) that don't start with zero: Namespace Prefix · test number · validate our paths · get theme details · Check if a string only contains numbers · UK Postcode · Match IPv6 Address 24 Sep 2014 Hi guys, I want to use only numbers here and for only numbers you can use the pattern which you also used with a regular expression.[edit]Added second part to regex - OriginalGriff[/edit] Examples is not matched, instead it is taken as two different numbers as "1", "9999". JavaScript RegExp [0-9] Expression. ? JavaScript RegExp Object. Example. Do a global search for the numbers 1, 2, 3 and 4 in a string: var str = "123456789"; Detailed example of building a regex to match a floating point number as an illustration of a common mistake: making everything optional. Regular Expression to Check if a string only contains numbers. Regex Tester isn't optimized for mobile devices yet. You can still take a look, but it might be a To match all characters from 0 to 255, we'll need a regex that matches In the 3-digit range in our example, numbers starting with 1 allow all 10 digits for the Items 1 - 20 This regular expression validates that the data entered is a number with a maximum of two Allows only positive integers that are greater then 0.