AMPscript Substring Function
https://gist.github.com/nmaratasdev/3d0d994a0b549a31291c78a43a68741f
AMPscript Replace Function
https://gist.github.com/nmaratasdev/166c2646d1c79851ce75d60f3aa7e0b3
AMPscript Length Function
https://gist.github.com/nmaratasdev/43d7cb952b740dba057cf045c7db62ef
AMPscript IndexOf Function
https://gist.github.com/nmaratasdev/f789f187dedd5eb64fbf0bafeb6797bc
AMPscript Concat Function
https://gist.github.com/nmaratasdev/ec499bcd601db21b4af331e102fc2118