I like Regex since I tried to create a validator for checking my identity card in my country back in the day.
I think it is worth to mention that there are multiple variants of Regex implementations like the one in Perl, Linux or PHP I think.
Thus it depends on the developer. It might make sense to adopt certain variant of Regex to get what you need.
Yes, that's a good point. The major points are the same across languages, but there are some differences (how the flags behave for example) - so if you're using the more advanced features, then watch out for cross language differences.
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