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