How to Extract Numbers from a String in JavaScript?

How to Remove Non-Numeric Characters from a String in JavaScript

In JavaScript, you may encounter situations where you need to extract only numeric characters from a string without utilizing DOM or browser functionality. To achieve this, we can leverage the powerful capabilities of JavaScript's string manipulation methods.

One efficient approach is to utilize the replace method along with a regular expression pattern (D). This pattern matches any non-numeric character in the input string. By replacing all non-numeric characters with an empty string '', we effectively strip them from the string.

Here's how you can implement this solution:

<code class="javascript">var myString = 'abc123.8<blah>';

//desired output is 1238
myString = myString.replace(/\D/g,'');</code>

In this example, the original string 'abc123.8' contains both numeric and non-numeric characters. By applying the replace method with the given regular expression, we obtain the desired numeric-only string: '1238'.

This technique proves useful in various scenarios, such as extracting numbers from input fields, parsing data from text files, or performing calculations on numeric values embedded in strings.

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