# RegexPattern.Options.subtract(_:)

- **Module:** RegexPattern.Options
- **Package:** libtmux-swift
- **Language:** Swift
- **Kind:** method
- **Page:** https://libtmux.org/reference/swift/regexpattern-options-subtract(_-)/

```
RegexPattern.Options.subtract(_:)(other: Self) -> ()
```

Removes the elements of the given set from this set.

In the following example, the elements of the `employees` set that are
also members of the `neighbors` set are removed. In particular, the
names `"Bethany"` and `"Eric"` are removed from `employees`.

    var employees: Set = ["Alicia", "Bethany", "Chris", "Diana", "Eric"]
    let neighbors: Set = ["Bethany", "Eric", "Forlani", "Greta"]
    employees.subtract(neighbors)
    print(employees)
    // Prints "["Diana", "Chris", "Alicia"]"

- Parameter other: A set of the same type as the current set.