Allow only [a-z][A-Z][0-9] in string using PHP

You can use the preg_replace function in PHP to remove any characters that do not match the specified pattern.

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php
preg-replace
string

You can use the preg_replace function in PHP to remove any characters that do not match the specified pattern. To allow only lowercase letters, uppercase letters, and digits in a string, you can use the following code:

Example of allowing only [a-z][A-Z][0-9] in string using PHP

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This will remove all characters that are not lowercase letters, uppercase letters, or digits from the $string variable.