There are certain skills that I always admire in other people. For example, when someone is fluent in using the command line, knows the right commands, and combines them by piping the output from one as input to another.

However, one valuable skill that I think everyone should have - programmer or not - is the ability to read and write Regular Expressions. You don't have to be perfect at it, but you just need to know that they exist, understand their basic structure, and grasp what the different symbols mean.

Regular expressions come in handy in many situations, be it refactoring a codebase with search and replace, searching through log files, or working with spreadsheets.

What do you think is a valuable skill for someone to have?