Community
|
September 5, 2022

Username-with-only-letters-numbers-and-underscore

Program To Verify Username With Only Letters, Numbers And Underscore

Sunny Kumar
Community

Program To Verify Username With Only Letters, Numbers And Underscore

This article will provide you with a way to check if a string contains alphanumeric characters with underscores. In other words, determine whether a string consists of only letters, numbers, underscore, and not any other character.

Regular Expressions are the best way to identify patterns within strings. They seem to be a bit difficult and irritating, but once you know how to use them, they're amazing!.

Basically, a regular expression is a pattern describing a certain amount of text. For example, we know that emails are always like:

username@domain.extension

If we want to describe the pattern of an email, we will say something like this: Starting with a username (a combination of letters and numbers), followed by an @ symbol, followed by the domain (another combination of letters and numbers) followed by the extension (that starts with a dot . followed by a combination of only letters).

The process of describing the pattern of an email is the same process you will follow when you want to create a regular expression. The only difference will be the syntax:

 

The regex you are looking for is:

[A-z_]

The length restriction for example can be edited like this:

{4,15}

So you put in your /conf/config.php file:

$Configuration['Garden']['User']['ValidationRegex'] = '[A-z_]';

$Configuration['Garden']['User']['ValidationLength'] = '{4,15}';

Probably change the translation here too:

$Definition['UsernameError'] = "Username can only contain letters, numbers, and underscores, and must be between 4 and 15 characters long.";


The Essential SEO Guide for Online Community and Forums
The Essential SEO Guide for Online Community and Forums. The ranking of your page is one of the main factors a search engine like Google considers when it decides which results to show at the top of its search engine listings
author
Rishika Shidling
The Best Gumroad Alternatives For 2023
An overview on the best Gumroad alternative for 2023
author
Sunny Kumar