Regular expression excercise - Sketch Engine When searching an online text we often need to find sequences matching some pattern rather than a particular fixed word. This can be achieved through the use of regular expressions. An on-line regular expression tutorial is available here. Here are some exercises that test your ability to use regular expressions. Exercise 1 Exercise 2 Exercise 3 Exercise 4 Further exercises (not interactive) and answers. Additional Practice on a text of your own   © 2018 Lexical Computing CZ s.r.o.