There are many general skills a programmer should have to be effective and valuable. Some are very general — for instance, the ability to learn and to think abstractly — but some are more specific — various tools and tricks of skilled programming.
Among those tools are several non-programming languages all programmers should know. Those include HTML, XML, SQL, and an old one whose name doesn’t end with “L” — Regular Expressions (aka REs, aka RegEx or RegExp).
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