Regex Guess and Test

There is nothing to hand in for this assignment, but please work through it thoroughly so that you can easily do the homework for next weekend. We will only cover repetition and alternators briefly in class, so this practice is important, even though I am not asking you to hand anything in.

Please go through this sheet (right click to download) all the way through 5.14 guessing an answer and then testing it in http://www.zytrax.com/tech/web/regex.htm all your answers.

Here is a full explanation of the *, + and ? and {} characters and a redo of the examples on the board.

• * means that the character before it does not have to appear, or could appear as many times as it likes
• + means the character before it has to appear, and can repeat
• ? means the character before it can appear or not appear
• If these shortcuts on repetition do not work, you will can use { }, which let you put the minimum and maximum appearances of the character before. { min , max }