src/main/software/amazon/event/ruler/JsonRuleCompiler.java [354:408]:
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    private static Patterns processMatchExpression(final JsonParser parser) throws IOException {
        final JsonToken matchTypeToken = parser.nextToken();
        if (matchTypeToken != JsonToken.FIELD_NAME) {
            barf(parser, "Match expression name not found");
        }
        final String matchTypeName = parser.getCurrentName();
        if (Constants.EXACT_MATCH.equals(matchTypeName)) {
            final JsonToken prefixToken = parser.nextToken();
            if (prefixToken != JsonToken.VALUE_STRING) {
                barf(parser, "exact match pattern must be a string");
            }
            final Patterns pattern = Patterns.exactMatch('"' + parser.getText() + '"');
            if (parser.nextToken() != JsonToken.END_OBJECT) {
                barf(parser, "Only one key allowed in match expression");
            }
            return pattern;
        } else if (Constants.PREFIX_MATCH.equals(matchTypeName)) {
            final JsonToken prefixToken = parser.nextToken();
            if (prefixToken == JsonToken.START_OBJECT) {
                return processPrefixEqualsIgnoreCaseExpression(parser);
            }

            if (prefixToken != JsonToken.VALUE_STRING) {
                barf(parser, "prefix match pattern must be a string");
            }
            final Patterns pattern = Patterns.prefixMatch('"' + parser.getText()); // note no trailing quote
            if (parser.nextToken() != JsonToken.END_OBJECT) {
                barf(parser, "Only one key allowed in match expression");
            }
            return pattern;
        } else if (Constants.SUFFIX_MATCH.equals(matchTypeName)) {
            final JsonToken suffixToken = parser.nextToken();
            if (suffixToken == JsonToken.START_OBJECT) {
                return processSuffixEqualsIgnoreCaseExpression(parser);
            }

            if (suffixToken != JsonToken.VALUE_STRING) {
                barf(parser, "suffix match pattern must be a string");
            }
            final Patterns pattern = Patterns.suffixMatch(parser.getText() + '"'); // note no beginning quote
            if (parser.nextToken() != JsonToken.END_OBJECT) {
                barf(parser, "Only one key allowed in match expression");
            }
            return pattern;
        } else if (Constants.NUMERIC.equals(matchTypeName)) {
            final JsonToken numericalExpressionToken = parser.nextToken();
            if (numericalExpressionToken != JsonToken.START_ARRAY) {
                barf(parser, "Value of " + Constants.NUMERIC + " must be an array.");
            }
            Patterns range = processNumericMatchExpression(parser);
            if (parser.nextToken() != JsonToken.END_OBJECT) {
                tooManyElements(parser);
            }
            return range;
        } else if (Constants.ANYTHING_BUT_MATCH.equals(matchTypeName)) {
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src/main/software/amazon/event/ruler/RuleCompiler.java [251:305]:
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    private static Patterns processMatchExpression(final JsonParser parser) throws IOException {
        final JsonToken matchTypeToken = parser.nextToken();
        if (matchTypeToken != JsonToken.FIELD_NAME) {
            barf(parser, "Match expression name not found");
        }
        final String matchTypeName = parser.getCurrentName();
        if (Constants.EXACT_MATCH.equals(matchTypeName)) {
            final JsonToken prefixToken = parser.nextToken();
            if (prefixToken != JsonToken.VALUE_STRING) {
                barf(parser, "exact match pattern must be a string");
            }
            final Patterns pattern = Patterns.exactMatch('"' + parser.getText() + '"');
            if (parser.nextToken() != JsonToken.END_OBJECT) {
                barf(parser, "Only one key allowed in match expression");
            }
            return pattern;
        } else if (Constants.PREFIX_MATCH.equals(matchTypeName)) {
            final JsonToken prefixToken = parser.nextToken();
            if (prefixToken == JsonToken.START_OBJECT) {
                return processPrefixEqualsIgnoreCaseExpression(parser);
            }

            if (prefixToken != JsonToken.VALUE_STRING) {
                barf(parser, "prefix match pattern must be a string");
            }
            final Patterns pattern = Patterns.prefixMatch('"' + parser.getText()); // note no trailing quote
            if (parser.nextToken() != JsonToken.END_OBJECT) {
                barf(parser, "Only one key allowed in match expression");
            }
            return pattern;
        } else if (Constants.SUFFIX_MATCH.equals(matchTypeName)) {
            final JsonToken suffixToken = parser.nextToken();
            if (suffixToken == JsonToken.START_OBJECT) {
                return processSuffixEqualsIgnoreCaseExpression(parser);
            }

            if (suffixToken != JsonToken.VALUE_STRING) {
                barf(parser, "suffix match pattern must be a string");
            }
            final Patterns pattern = Patterns.suffixMatch(parser.getText() + '"'); // note no beginning quote
            if (parser.nextToken() != JsonToken.END_OBJECT) {
                barf(parser, "Only one key allowed in match expression");
            }
            return pattern;
        } else if (Constants.NUMERIC.equals(matchTypeName)) {
            final JsonToken numericalExpressionToken = parser.nextToken();
            if (numericalExpressionToken != JsonToken.START_ARRAY) {
                barf(parser, "Value of " + Constants.NUMERIC + " must be an array.");
            }
            Patterns range = processNumericMatchExpression(parser);
            if (parser.nextToken() != JsonToken.END_OBJECT) {
                tooManyElements(parser);
            }
            return range;
        } else if (Constants.ANYTHING_BUT_MATCH.equals(matchTypeName)) {
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