Function to validate regular expression

Description

I have been missing a core function in PHP to validate a regular expression. I am therefore proposing something like preg_validate().

There are some workarounds mentioned in this StackOverflow thread. But from my understanding they will all produce a PHP warning that needs to be suppressed.
https://stackoverflow.com/questions/4440626/how-can-i-validate-regex

What are your thoughts and opinions on implementing a regex syntax validator?

从提议的入口点 preg_validate() 以及关于验证正则表达式语法的链接 StackOverflow 讨论开始。没有指定源文件或测试，因此首先确定 PHP 核心的正则表达式验证函数应放在哪里，以及应如何处理警告抑制。完成的标准是就实现范围达成一致，并为提议的行为编写测试。