Simple email validation regexpr to handle subdomains and other stuff. See example

Splitting operators from numbers for a calculator

For Stackoverflow by Sufiyan Ghori

parse tanggal

Finds the discriminator flawlessly (as per its use)

Strips all non "A-Z,a-z,0-9+-_" characters and replaces them with a single "-"

15 digits for integer real number: 18 digits for before-dot part (*what it's called?)