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Answer:

The language that consists of the single string "turtle".


Regular Expression Tester

Regular Expression
(Delimit with quotes)
String
(Delimit with quotes)

The tester checks if strings match the regular expression turtle. Enter strings in the text box labeled String. Click on the button to see if the string matches the regular expression.

The string must exactly match the regular expression. Be careful with spaces. If you type turtle in the string box, it will not match the regular expression because of the space at the end.

Change the regular expression to somthing like cat or dog and observe the result. Again, be careful with spaces. Spaces before and after the word are included in the regular expression.


QUESTION 4:

What regular language is described by the RE a x ?