storing negative floating point numbers in an array using regular expressions in JavaScript

Question

storing negative floating point numbers in an array using regular expressions in JavaScript

I am currently working on creating a regular expression that can detect both positive and negative floating point numbers of any length. My goal is to store the captured values in an array as double data type. I have attempted the following pattern:

input.match(/^[-+]?(\d*)\.?(\d*)$/)

For example, if my number is -123.432, the expected result should be [-123.432,-123.432]. Similarly, if my number is 23.45, it should return [23.45,23.45].

What would be the ideal regular expression to match both negative and positive floating point numbers and obtain the desired result?

javascript

Answer 1

Answer №1

Here is a helpful regex for numbers in JavaScript:

[-+]?([0-9]*\.[0-9]+|[0-9]+)

You can test this regular expression for JS at:

All you need to do is paste your regexp and click on show match.

For more information on floating point regex, check out this link: FLOATING POINT REGEX

Answer 2

Here is a helpful regex for numbers in JavaScript:

[-+]?([0-9]*\.[0-9]+|[0-9]+)

You can test this regular expression for JS at:

All you need to do is paste your regexp and click on show match.

For more information on floating point regex, check out this link: FLOATING POINT REGEX

Answer 3

Answer №2

I'm not sure I fully grasp your query

Are you asking if you want both array[0] and array[1] to have the same value? It seems unnecessary; you could simply write some code to achieve this rather than relying on regular expressions.

However, it is feasible - you can exclude groups by adding ?: at the start or omit them altogether if they are not required. You can also create additional groups by using more parentheses. Therefore, your modified regexp would appear as follows:

input.match(/^([-+]?\d*\.?\d*)$/)

Nonetheless, it appears to serve no real purpose

Answer 4

I'm not sure I fully grasp your query

Are you asking if you want both array[0] and array[1] to have the same value? It seems unnecessary; you could simply write some code to achieve this rather than relying on regular expressions.

However, it is feasible - you can exclude groups by adding ?: at the start or omit them altogether if they are not required. You can also create additional groups by using more parentheses. Therefore, your modified regexp would appear as follows:

input.match(/^([-+]?\d*\.?\d*)$/)

Nonetheless, it appears to serve no real purpose

Answer 5

Answer №3

An improved regular expression to match numbers with or without decimal points is:

/-?\d+(?:.\d+)?/

This regex will find sequences of at least 1 digit that may start with a - sign and may include a . in the middle.

It's important to note that the original regular expression specifies that the number must be the entire string (using ^ and $). If you want to extract numbers from longer texts, it's best not to include these anchors.

After extracting the number as a string, you can use the unary plus operator to convert it into a Number. Then simply create an array with the number repeated twice and your task is complete.

var input = '123.45';
var number = +input;
var arr = [number, number];

NOTE: The floating point should not have a plus sign preceding it, so it's best not to match this. For valid floating points, consider changing the start of the regex to [+-]? instead of just -?.

Some examples of invalid floating points are:

+123
.123
-.123
123.

EDIT: Check out the working JsBin example here: http://jsbin.com/ehurAva/1/edit

Answer 6

An improved regular expression to match numbers with or without decimal points is:

/-?\d+(?:.\d+)?/

This regex will find sequences of at least 1 digit that may start with a - sign and may include a . in the middle.

It's important to note that the original regular expression specifies that the number must be the entire string (using ^ and $). If you want to extract numbers from longer texts, it's best not to include these anchors.

After extracting the number as a string, you can use the unary plus operator to convert it into a Number. Then simply create an array with the number repeated twice and your task is complete.

var input = '123.45';
var number = +input;
var arr = [number, number];

NOTE: The floating point should not have a plus sign preceding it, so it's best not to match this. For valid floating points, consider changing the start of the regex to [+-]? instead of just -?.

Some examples of invalid floating points are:

+123
.123
-.123
123.

EDIT: Check out the working JsBin example here: http://jsbin.com/ehurAva/1/edit

storing negative floating point numbers in an array using regular expressions in JavaScript

Answer №1

Answer №2

Answer №3

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