shell/console/src/main/java/org/apache/karaf/shell/console/completer/Parser.java [355:383]:
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    CharSequence findVar() {
        int start = current;
        char c = peek();

        if (c == '{') {
            next();
            int end = find('}', '{');
            return text.subSequence(start, end);
        }
        if (c == '(') {
            next();
            int end = find(')', '(');
            return text.subSequence(start, end);
        }

        if (Character.isJavaIdentifierPart(c)) {
            while (c == '$') {
                c = next();
            }
            while (!eof() && (Character.isJavaIdentifierPart(c) || c == '.') && c != '$') {
                next();
                c = peek();
            }
            return text.subSequence(start, current);
        }
        throw new IllegalArgumentException(
            "Reference to variable does not match syntax of a variable: "
                + context(start));
    }
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shell/core/src/main/java/org/apache/karaf/shell/support/parsing/GogoParser.java [370:398]:
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    CharSequence findVar() {
        int start = current;
        char c = peek();

        if (c == '{') {
            next();
            int end = find('}', '{');
            return text.subSequence(start, end);
        }
        if (c == '(') {
            next();
            int end = find(')', '(');
            return text.subSequence(start, end);
        }

        if (Character.isJavaIdentifierPart(c)) {
            while (c == '$') {
                c = next();
            }
            while (!eof() && (Character.isJavaIdentifierPart(c) || c == '.') && c != '$') {
                next();
                c = peek();
            }
            return text.subSequence(start, current);
        }
        throw new IllegalArgumentException(
            "Reference to variable does not match syntax of a variable: "
                + context(start));
    }
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