However, arithmetic on numeric values is very slow compared to the integer types, or to the floating-point types described in the next section. Here we're searching for one or more digits followed by a period. But, what about a RegEx pre-validation check? – this part of regex is to identify float numbers. No, it's too big. To only match the period, you need to escape it: \. To get a brief overview, check our tutorial on the Java regular expressions API. Regular Expression should not allow numbers alone. Regex match float or integer. Getting a textbox to accept negative number. 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? 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. The quantifier ‹ {n} ›, where n is a nonnegative integer, repeats the preceding regex token n number of times. It is based on a currency regular expression by Tom Persing. 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. Regular Expression Not working for text box accepting only number. 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. You could achieve the same by typing ‹ \d › 100 times. For example, the regex [+-]?\d+ will match any integer, right, but is -999999999999999999999 a valid integer? But, it is a valid double. The ‹ \d{100} › in ‹ \b\d{100}\b › matches a string of 100 digits. Note that the regex will not guarantee a clean parse, but it can go a long way. Regex match float or integer. Regular expression for number only which accept decimal if user inputs it. \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 numbers. We will not try to match numbers with an exponent, such as The Regex will match an integer or float, with a preceding +/- sign. 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 number. The negative sign (-) is allowed. ‹ {1} › repeats the preceding token once, as it would without any quantifier. 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