Added helper function to expand a slice to a given length

misc.go

@@ -10,7 +10,9 @@ var digitChars = []rune{'0', '1', '2', '3', '4', '5', '6', '7', '8', '9'}
 var wordChars = []rune("abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_")
 var LBRACKET rune = 0xF0000
 var RBRACKET rune = 0xF0001
-var ANY_CHAR rune = 0xF0002 // Represents any character - used for states where the allChars flag is on.
+var ANY_CHAR rune = 0xF0002    // Represents any character - used for states where the allChars flag is on.
+var LPAREN_CHAR rune = 0xF0003 // Parentheses in regex are concatenated with this - it acts as a pseudio-parentheses
+var RPAREN_CHAR rune = 0xF0004
 
 // Returns true if str[idx] and str[idx-1] are separated by a word boundary.
 func isWordBoundary(str []rune, idx int) bool {
@@ -121,3 +123,10 @@ func genRange(start, end int) []int {
 func allCases(r rune) []rune {
 	return []rune{unicode.ToLower(r), unicode.ToUpper(r), unicode.ToTitle(r)}
 }
+
+// Expands a slice to the given length
+func expandSlice[T any](slc []T, newSize int) []T {
+	toRet := make([]T, newSize)
+	copy(toRet, slc)
+	return toRet
+}