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Please help me in giving a regex to check below format in JavaScript

Format: 16 digit number up to three decimal points.

I am using this

if (/^\d+(\.\d)?\d*$/.test(str))

But how to check 3 decimal points after . and up to 16 digits only

Try this it may help, set a range

/^\d{1,16}(.\d{1,3})$/.test(str)

Regex in JavaScript for validating decimal numbers, This will capture every case you posted as well as .23. Limit to 9 decimal places var isDecimal = string.match( /^(\d+\.?\d{0,9}|\.\d{1,9})$/ );. No  I believe that regular expression will perform a strict test for the typical integer or decimal-style floating point number. When matched: $1 contains the full number that matched; $2 contains the (possibly empty) leading sign (+/-) $3 contains the value to the left of the decimal point

You can limit the length. If you want to restrict the length to 3 after decimal, try /^\d+(.\d){3}$/.

var str = '1234.567';
console.log(/^\d+(.\d{3})$/.test(str));
var str1 = '1234.56';
console.log(/^\d+(.\d{3})$/.test(str1));
var str2 = '1234.5678';
console.log(/^\d+(.\d{3})$/.test(str2))

regex - check for decimal(javascript), Javascript function to check if a field input contains numbers as well as decimal numbers Sometimes it is required to input a number with decimal part To check the said format we have used the various regular expression. Regex in JavaScript for validating decimal numbers. I want a regex in JavaScript for validating decimal numbers. It should allow only up to two decimal places. For example, it should allow 10.89 but not 10.899. It should also allow only one period (. ). For example, it should allow 10.89 but not 10.8.9.

Try this...

var str = '1344.511';
console.log(/^\d{1,16}(.\d{1,3})$/.test(str))
var str1 = '12454.5645';
console.log(/^\d{1,16}(.\d{1,3})$/.test(str1))
var str2 = '122112222222234.567';
console.log(/^\d{1,16}(.\d{1,3})$/.test(str2))
var str3 = '122112222222234.5676';
console.log(/^\d{1,16}(.\d{1,3})$/.test(str3))
var str4 = '12211244222222234.567';
console.log(/^\d{1,16}(.\d{1,3})$/.test(str4))
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>

JavaScript : Checking for Floating numbers, regular expression for positive decimal numbers,decimal regular expression validation,regular expression non negative decimal,regex for number with 2  How to Check If A String Is a Number (Numeric) using Regex (C++/Javascript) ? October 16, 2019 No Comments c / c++ , javascript , regex , string Validate if a given string can be interpreted as a decimal number.

Regular Expression For Decimal Validation, This allows some string based tests to verify that the string's pattern matches acceptable numeric data. Only Digits. A basic test: is there data and is it only digits. Checking for Floating point numbers. A floating number has the following parts. A decimal integer. A decimal point ('.'). A fraction. An exponent (optional).

Validating Numbers, Validate decimal numbers - match() method retrieves the matches when matching a string against a regular expression. Regular Expression to regular expression for positive decimal numbers,decimal regular expression validation,regular expression non negative decimal,regex for number with 2 decimal places,regex decimal number c#,regular expression for decimal number with 2 precision,regex to check decimal values,regular expression decimal 2 digits

Validate decimal numbers - javascript tutorial, At first glance, writing a regular expression to match a number should be easy right? We have the \d special character to match any digit, and all we need to do is  Both assume that both have at least one digit before and one after the decimal place. To require that the whole string is a number of this form, wrap the expression in start and end tags such as (in Perl's form): ^\d+(\.\d{1,2})?$ To match numbers without a leading digit before the decimal (.12) and whole numbers having a trailing period (12.

Comments
  • Could you just split on the "." and check if the length of the 2nd element is 2 (3 digits)?
  • Can you clarify your question - part says "up to three decimal points" while another part says "check 3 decimal points" - so answers are being provided for one or the other.
  • upto 3 decimal point means after . max 3 numbers allowed.
  • no, for 1234567890123456.123 your regex will pass it, while here total numbers are 19 and OP mentioned only 16 max, and that can have 3 decimal places then it will be 13+3 = 16, hope its clear?
  • @DeepakSharma you have a point, but specifics are debatable unless OP can clarify: 13+3=17 because it's 13+1+3 (max 16 digits includes .)
  • @freedomn-m I conclude that if there are few numbers after decimal, then we need to reduce the length of numbers before decimal as he said But how to check 3 decimal points after . *and up to 16 digits only*
  • Allows multiple ., eg passes with '1234.5.6.7'
  • not workign, I want the regrex to allow numbers without decimal. if decimal is there then max 3 digits after decimal. if decimal is not there it should also allow