# RegexPattern.Options.union(_:)

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

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

Returns a new option set of the elements contained in this set, in the given set, or in both.

This example uses the `union(_:)` method to add two more shipping options
to the default set.

    let defaultShipping = ShippingOptions.standard
    let memberShipping = defaultShipping.union([.secondDay, .priority])
    print(memberShipping.contains(.priority))
    // Prints "true"

- Parameter other: An option set.
- Returns: A new option set made up of the elements contained in this
  set, in `other`, or in both.