s2[0] = 42                     // setting s2[0] changes s1[0] as well
fmt.Println(s1, s2)            // prints [42] [42 2 3]

var m1 = make(map[string]int)
var m2 = m1                    // m2 stores the map descriptor of m1
m1["foo"] = 42                 // setting m1["foo"] changes m2["foo"] as well
fmt.Println(m2["foo"])         // prints 42
</pre>

pkg regexp/syntax, const ErrInvalidEscape = "invalid escape sequence"
pkg regexp/syntax, const ErrInvalidNamedCapture = "invalid named capture"
pkg regexp/syntax, const ErrInvalidPerlOp = "invalid or unsupported Perl syntax"
pkg regexp/syntax, const ErrInvalidRepeatOp = "invalid nested repetition operator"
pkg regexp/syntax, const ErrInvalidRepeatSize = "invalid repeat count"
pkg regexp/syntax, const ErrInvalidUTF8 = "invalid UTF-8"

pkg regexp/syntax, const OpQuest Op
pkg regexp/syntax, const OpRepeat Op
pkg regexp/syntax, const OpStar Op
pkg regexp/syntax, const OpWordBoundary Op
pkg regexp/syntax, const POSIX Flags
pkg regexp/syntax, const Perl Flags
pkg regexp/syntax, const PerlX Flags
pkg regexp/syntax, const Simple Flags
pkg regexp/syntax, const UnicodeGroups Flags
pkg regexp/syntax, const WasDollar Flags