core/src/main/java/com/digitalpebble/stormcrawler/filtering/regex/RegexURLNormalizer.java
private List<Rule> readRules(ArrayNode rulesList) {
        List<Rule> rules = new ArrayList<>();
        for (JsonNode regexNode : rulesList) {
            if (regexNode == null || regexNode.isNull()) {
                LOG.warn("bad config: 'regex' element is null");
                continue;
            }
            JsonNode patternNode = regexNode.get("pattern");
            JsonNode substitutionNode = regexNode.get("substitution");

            String substitutionValue = "";
            if (substitutionNode != null) {
                substitutionValue = substitutionNode.asText();
            }
            if (patternNode != null
                    && StringUtils.isNotBlank(patternNode.asText())) {
                Rule rule = createRule(patternNode.asText(), substitutionValue);
                if (rule != null) {
                    rules.add(rule);
                }
            }
        }
        if (rules.size() == 0) {
            rules = EMPTY_RULES;
        }
        return rules;
    }
private List<Rule> readRules(ArrayNode rulesList) {
        List<Rule> rules = new ArrayList<>();
        for (JsonNode regexNode : rulesList) {
            if (regexNode == null || regexNode.isNull()) {
                LOG.warn("bad config: 'regex' element is null");
                continue;
            }
            JsonNode patternNode = regexNode.get("pattern");
            JsonNode substitutionNode = regexNode.get("substitution");

            String substitutionValue = "";
            if (substitutionNode != null) {
                substitutionValue = substitutionNode.asText();
            }
            if (patternNode != null
                    && StringUtils.isNotBlank(patternNode.asText())) {
                Rule rule = createRule(patternNode.asText(), substitutionValue);
                if (rule != null) {
                    rules.add(rule);
                }
            }
        }
        if (rules.size() == 0) {
            rules = EMPTY_RULES;
        }
        return rules;
    }
Populates a List of Rules off of JsonNode.