Regex are not only complex they are CPU intensive, it should be used carefully as they perform backtracking while performing checks.
It could be CPU intensive and can performance bottle neck.
Also maintaining regex with proper documentation comments are necessary.
Small mistakes can be leads to potential validation issues.
A global object or class should be maintained at application level so that considering single source and reusability, it helps to identify the usage or regex through out the app and easy to maintain and replace and unit test.
Flags tweak how matching work, hence should be used and tested carefully.
Regex literal example: /\s+/g
g - global, find every match instead of just the first.
i - case-insensitive.
m - multiline, so ^ and $ match line starts/ends, not just string start/end.
s - dotall, so . also matches newlines.
u - unicode-aware, needed for many emoji and non-ASCII patterns.
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