How to remove all special characters from a string with magento 2 as a best practice?

Magento Contains Match.php file they contain CONSTANT like SPECIAL_CHARACTERS and with that constant all the special character are available.
File path is Magento\Framework\Search\Adapter\Mysql\Query\Builder\Match.php

When we need to remove or replace special character with some other character you can use Magento default constant.

Match.php file with a constant declaration like as below,
const SPECIAL_CHARACTERS = ‘-+~/\\<>\'”:*$#@()!,.?`=%&^’;
When we need to modify a string with special character to some custom value or blank you can do as below way,

The result will be, Replace all special character with one space.
“Test1 23 45 789 1”

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