Allow hyphen to be escaped inside character class
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@@ -116,6 +116,13 @@ func newEscapedNode(c rune, inCharClass bool) (postfixNode, error) {
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case 'v': // Vertical tab
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toReturn.nodetype = CHARACTER
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toReturn.contents = append(toReturn.contents, rune(11))
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case '-': // Literal hyphen - only in character class
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if inCharClass {
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toReturn.nodetype = CHARACTER
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toReturn.contents = append(toReturn.contents, '-')
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} else {
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return postfixNode{}, fmt.Errorf("Invalid escape character.")
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}
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default: // None of the above - append it as a regular character
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if isNormalChar(c) { // Normal characters cannot be escaped
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return postfixNode{}, fmt.Errorf("Invalid escape character.")
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