Use regexp.Compile to parse a pattern into a reusable object, handling errors for invalid syntax.
Use regexp.Compile to parse a pattern string into a *regexp.Regexp object, checking the returned error for syntax issues.
re, err := regexp.Compile(`^\d{3}-\d{2}-\d{4}$`)
if err != nil {
log.Fatal(err)
}
If the pattern is constant and known at compile time, use regexp.MustCompile to panic on error instead of returning it.
re := regexp.MustCompile(`^\d{3}-\d{2}-\d{4}$`)
Compiling a regex turns a text pattern into a reusable object that your program can use to find matches. Think of it like translating a recipe into a finished dish; you do the work once so you can serve it many times without re-reading the instructions. You must handle potential errors if the pattern is invalid.