String Manipulation Courses

Java Basics Course (How To)
Treehouse

Python: aprender a programar
Universitat Politècnica de València via edX

Search a String Variable with JavaScript Methods
Coursera Project Network via Coursera

JavaScript Strings: Properties and Methods
Coursera Project Network via Coursera

Learn C++ by Creating
Udemy

Java Programming Masterclass: Learn Java From Scratch
Udemy

Python For Everybody : Learn Python Programming MADE EASY
Udemy

Learn practical Python by examples and projects
Udemy

Linux command line and Bash Shell Scripting
Udemy

Java Puzzles to Eliminate Code Fear
Udemy