Fixed buildFailureMessage.groovy (#1902)

Signed-off-by: pgodithi <[email protected]>

DEVELOPER_GUIDE.md

@@ -240,7 +240,7 @@ and outputs [Hello_Jenkinsfile.txt](tests/jenkins/jobs/Hello_Jenkinsfile.txt). I
 
 - To update the recorded .txt file run `./gradlew test -info -Ppipeline.stack.write=true` or update its value in [gradle.properties](gradle.properties).
 
-- To run a specific test case, run `./gradlew test -info -tests=TestCaseClassName`
+- To run a specific test case, run `./gradlew test -info --tests=TestCaseClassName`
 
 #### Tests for jenkins job
 Each jenkins job should have a test case associated with it. 

vars/buildFailureMessage.groovy

@@ -2,18 +2,22 @@ import com.cloudbees.groovy.cps.NonCPS
 import org.apache.commons.io.IOUtils
 @NonCPS
 def call(){
-    String ERROR_STRING = "ERROR"
+    String ERROR_STRING = "Error building"
     List<String> message = []
     Reader performance_log = currentBuild.getRawBuild().getLogReader()
     String logContent = IOUtils.toString(performance_log)
     performance_log.close()
     performance_log = null
     logContent.eachLine() { line ->
-        if (line.matches(".*?$ERROR_STRING(.*?)")) {
-            line=line.replace("\"", "")
+        line=line.replace("\"", "")
+        //Gets the exact match for Error building
+        def java.util.regex.Matcher match = (line =~ /$ERROR_STRING.*/) 
+        if (match.find()) {
+            line=match[0]
             message.add(line)
         }
     }
+    //if no match returns as Build failed
     if(message.isEmpty()){
         message=["Build failed"]
     }