Build log regex

[capt edgar]

Hi there
I'm new to Jenkins and I was wondering if the following is possible to achieve in Jenkins
I have created a Jenkins multijob which has 4 child jobs that run inside it.
Whenever any of the child job fails, I would click on the console output of the parent job to identify which if the child job failed, then click on the console output of the child job to get me the actual reason why it failed.

In my parent job, I have added a post build action called "editable email notification" which I use to send edited email information based on whether the parent job was success, failure or unstable. I have added an environment variable called ${BUILD_URL} with some other custom environment variables which is a requirement.

${BUILD_URL} will only return the build status of my parent job but not tell me which of the child job failed and what was the console output in the child job for the fail.

On googling I found something about build log regex pattern which can get me what I want but it is not very clear.

Please advice

Regards