Page Comparison

if (relatedIssue === null) //Checks if the email is commenting on a issue.
{
    var allReferences = jemhUtils.getReferencedMessageIds().toString(); //Gathers all of the References from the email
to check if a Issue Message-Id is found
    
    if(allReferences !== null && !allReferences.isEmpty()){ //Checks if the returned reference headers are null or empty
        
        var referencesString = allReferences.toString(); //Converts all reference Headers  to a single string
        var pattern = Java.type("java.util.regex.Pattern").compile("JIRA\.([0-9]+)\."); //RegexCompiles a Regexp Pattern to extract only the IssueId from the MessageReference-Id
        var matcher = pattern.matcher(allReferencesreferencesString);
        
        if(matcher.find()){ //Runs if a match is found
        {
            var group = matcher.group(1); //Gathers the first group RegexRegexp match.  In this case the Issue ID 
            var matchedIssueidAsLong = issueManagertextUtils.getAllIssueKeysparseLong(group).toString().replace("[", "").replace("]", ""; //Converts the Issue ID String into a number of type 'Long'
            
            if(issueManager.getIssue(idAsLong) !== null){ //Checks if an issue with the ID present in the reference header is valid
                var matchedIssue = issueManager.getIssueObject(idAsLong); //Searchs forRetrieves the issue withusing the id Issue ID
                var fieldObject = customFieldManager.getCustomFieldObjectByName("exampleSource"); //CreatesGets athe Custom Field Object for the relevant Custom Field, "example" needs to be changed
                
                if(fieldObject !== null){ //Checks if the Custom Field is valid
                    var fieldValue = issueManager.getIssueObject(matchedIssue).getCustomFieldValue(fieldObject); //ChecksRetrieves for athe value withinof the issueCustom Field thatpresent matchedon the Id Matched Issue
                    
                    if (fieldValue !== null){ // Checks if there is a value set, If there is then add this value to new issue
            
 {                       print("value was found on the related issue: "+ matchedIssue);
                        resultMap.put("example", fieldValue); //Sets value on the new issue, "example" needs to be changed to the field name
                    }
                }
            }
        }
    }
}