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Crafting the Perfect RegEx for a Decimal Number with Maximum Length

RegEx for decimal number with maximum length Zero not woking

javascript

regex

Автор: vlogize

Загружено: 2025-04-09

Просмотров: 3

Описание: Discover how to create an effective `RegEx` pattern to validate decimal numbers up to a maximum length of 10 digits. This post breaks down the intricacies of regex for JavaScript enthusiasts.
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This video is based on the question https://stackoverflow.com/q/73358313/ asked by the user 'sridharan' ( https://stackoverflow.com/u/3215427/ ) and on the answer https://stackoverflow.com/a/73358330/ provided by the user 'The fourth bird' ( https://stackoverflow.com/u/5424988/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

Visit these links for original content and any more details, such as alternate solutions, latest updates/developments on topic, comments, revision history etc. For example, the original title of the Question was: RegEx for decimal number with maximum length Zero not woking

Also, Content (except music) licensed under CC BY-SA https://meta.stackexchange.com/help/l...
The original Question post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license, and the original Answer post is licensed under the 'CC BY-SA 4.0' ( https://creativecommons.org/licenses/... ) license.

If anything seems off to you, please feel free to write me at vlogize [AT] gmail [DOT] com.
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Crafting the Perfect RegEx for a Decimal Number with Maximum Length

The Problem: Validating Numbers with RegEx

If you're working with JavaScript and need to validate number inputs, you might face a challenge when it comes to creating a regular expression (RegEx) that accurately captures decimal numbers, particularly if you want to limit the input to a specific range and size. For instance, you may want to check that the input starts from 1 and allows a maximum of 10 digits without exceeding two decimal places.

Recently, a developer encountered an issue where their pattern was unable to correctly validate a single zero after typing one. Let’s dive into the steps needed to craft the right RegEx for such a scenario.

Solution: Constructing the Right Regular Expression

In order to create a correct RegEx pattern that satisfies the requirements, we need to break the problem down into manageable parts. Here's a simple yet effective approach:

Key Components of the RegEx

Start with a Non-Zero Digit:

Since the number must start with a digit from 1 to 9, we’ll use the pattern [1-9] to ensure it does not start with zero.

Follow with Any Digits:

To complete the number up to 10 digits, we can permit the following digits to be any from 0 to 9. We achieve this by using [0-9]{0,9}, which allows up to 9 additional digits after the first one.

Optional Decimal Part:

If we want to allow decimal points, we need to match a decimal followed by up to two digits. This can be expressed as ([,.][0-9]{0,2})?, making the decimal optional.

Final Regular Expression Pattern

Combining all the elements above, our complete RegEx pattern becomes:

[[See Video to Reveal this Text or Code Snippet]]

Explanation of the Pattern

^: Asserts the start of the string.

[1-9]: Ensures the number starts with any digit from 1 to 9.

[0-9]{0,9}: Allows up to 9 additional digits (which gives a total of 10 including the first digit).

([,.][0-9]{0,2})?: Matches an optional decimal point followed by 0 to 2 digits. The use of both . and , provides flexibility based on locale preferences.

$: Asserts the end of the string.

Conclusion

Creating a RegEx for validating decimal numbers can seem daunting at first, but by breaking down the requirements into smaller parts, you can build a pattern that meets your needs. The structure provided ensures that you can validate numbers starting from 1, up to a maximum length of 10 digits with an optional decimal point.

If you're new to regular expressions, take some time to experiment with various patterns, and you'll quickly become proficient. Happy coding!

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Crafting the Perfect RegEx for a Decimal Number with Maximum Length

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