\d matches any digit, and is simpler than writing [0-9]; by making the decimal fraction optional my answer will also match integer values It is based on a currency regular expression by Tom Persing. Regular Expression Not working for text box accepting only number. For example, the regex [+-]?\d+ will match any integer, right, but is -999999999999999999999 a valid integer? The negative sign (-) is allowed. Those numbers are always The Regex will match an integer or float, with a preceding +/- sign. Here we're searching for one or more digits followed by a period. To get a brief overview, check our tutorial on the Java regular expressions API. Regex match float or integer. But, it is a valid double. The quantifier ‹ {n} ›, where n is a nonnegative integer, repeats the preceding regex token n number of times. Regular Expression for number. The question mark, in the end, signifies that this complete group is optional; Regular expressions are a very broad topic. The ‹ \d{100} › in ‹ \b\d{100}\b › matches a string of 100 digits. 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: Regular expression for number only which accept decimal if user inputs it. ‹ {1} › repeats the preceding token once, as it would without any quantifier. This regular expression will match on a real / decimal / floating point / numeric string with no more than 2 digits past the decimal. 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. We will not try to match numbers with an exponent, such as The Regex will match an integer or float, with a preceding +/- sign. as seperator). Note that the regex will not guarantee a clean parse, but it can go a long way. But, what about a RegEx pre-validation check? 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. 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. regular expression for numbers. important:. 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? No, it's too big. However, arithmetic on numeric values is very slow compared to the integer types, or to the floating-point types described in the next section. def number? Getting a textbox to accept negative number. Regex match float or integer. – this part of regex is to identify float numbers. 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