This regular expression will match on a real / decimal / floating point / numeric string with no more than 2 digits past the decimal. regular expression for numbers. To only match the period, you need to escape it: \. The ‹ \d{100} › in ‹ \b\d{100}\b › matches a string of 100 digits. More precisely, it will check if the “content” of a given input of an arbitrary type belongs to one of the following types (classes): Integer, Float. We use the following terms below: The scale of a numeric is the count of decimal digits in the fractional part, to the right of the decimal point. \d matches any digit, and is simpler than writing [0-9]; by making the decimal fraction optional my answer will also match integer values Regular expression for number only which accept decimal if user inputs it. The quantifier ‹ {n} ›, where n is a nonnegative integer, repeats the preceding regex token n number of times. as seperator). Getting a textbox to accept negative number. But, it is a valid double. important:. Regular Expression for number. Regular Expression should not allow numbers alone. The negative sign (-) is allowed. But, what about a RegEx pre-validation check? No leading zeroes or commas. You could achieve the same by typing ‹ \d › 100 times. def number? Regex match float or integer. – this part of regex is to identify float numbers. ‹ {1} › repeats the preceding token once, as it would without any quantifier. Example: Matching Floating Point Numbers with a Regular Expression, Our regex should also match integers and floating point numbers where the integer part is not given. We will not try to match numbers with an exponent, such as The Regex will match an integer or float, with a preceding +/- sign. However, arithmetic on numeric values is very slow compared to the integer types, or to the floating-point types described in the next section. The question mark, in the end, signifies that this complete group is optional; Regular expressions are a very broad topic. For example, the regex [+-]?\d+ will match any integer, right, but is -999999999999999999999 a valid integer? Reason I ask is that your string is not one number, but 4 separate numbers, and you would either need to do multiple regex matches to the string (starting at the prior matches endpoint), or do you just want all the numeric digits as a single string? Can anyone help me with the regular expression for any number from 0 - 10 with maximum of 2 decimal Valid numbers: 0.23 1.02 6.2 7.20 10.00 10 Invalid numbers: Note that the regex will not guarantee a clean parse, but it can go a long way. RegEx for both, integer and float, I need a regex to match both, integer values aswell as float numbers (whereas float numbers have a "." Regex match float or integer. Those numbers are always The Regex will match an integer or float, with a preceding +/- sign. 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