exrex:tldr:fad44

The command "exrex --simplify '${select}'" is invoking the "exrex" tool with the parameter "--simplify" along with the value '${select}'.

exrex is a Python tool used for generating all possible matching strings that match a given regular expression. It generates all possible combinations of characters that match the specified regular expression pattern.

The "--simplify" flag, when used with exrex, simplifies the output. It removes any duplicate strings or unnecessary repetitions from the generated list of matching strings.

In this specific command, the value '${select}' is likely a placeholder or variable that represents a regular expression pattern. exrex will generate all possible matching strings for this regular expression, and the "--simplify" flag will ensure that any redundant or repeated strings are eliminated from the output.