import Foundation

do {
    let _ = try NSRegularExpression(pattern: "(", options: [])
} catch {
    print(error)
}

$ swift main.swift
Error Domain=NSCocoaErrorDomain Code=2048 "The value “(” is invalid." UserInfo={NSInvalidValue=(}

$ swift main.swift
swift main.swift
0  swift            0x0000000003ae8ee8
1  swift            0x0000000003ae9626
2  libpthread.so.0  0x00007f5be1c6d390
3  libFoundation.so 0x00007f5bda4b3350 __HALT + 0
4  libFoundation.so 0x00007f5bda4c5495
5  libFoundation.so 0x00007f5bda4d011e CFDictionaryCreate + 270
6  libFoundation.so 0x00007f5bda60436b _CFRegularExpressionCreate + 427
7  libFoundation.so 0x00007f5bda7ec86b
8  libFoundation.so 0x00007f5bda7e9a70 _T010Foundation19NSRegularExpressionCACSS7pattern_AC7OptionsV7optionstKcfC + 96
9  libFoundation.so 0x00007f5be1fe60d0 _T010Foundation19NSRegularExpressionCACSS7pattern_AC7OptionsV7optionstKcfC + 125814464
10 swift            0x0000000000f2df8f
11 swift            0x0000000000f32132
12 swift            0x00000000004c4966
13 swift            0x00000000004b01e9
14 swift            0x00000000004abf61
15 swift            0x0000000000465594
16 libc.so.6        0x00007f5be017e830 __libc_start_main + 240
17 swift            0x0000000000462e69
Stack dump:
0.  Program arguments: /usr/bin/swift -frontend -interpret main.swift -disable-objc-interop -color-diagnostics -module-name main
Illegal instruction