Use Ruby

1- "Lions and tigers and bears, oh my!" Enter the following statement into IRB, then use an if state- ment and a regular expression to search for the word Lions at the beginning of the string:

2- "Once upon a time there were three bears." Enter the following statement into IRB, then use an if state- ment and a regular expression to search for a four-letter word beginning with the letters ti followed by two characters, a blank space, and then a five-letter word beginning with the letters th:

3- string = "Once upon a time there were three bears." Enter the following statement into IRB, then use an if state- ment and a regular expression to search for the charactersrs. at the end of the text string:

4- "Once upon a time there were three bears." Enter the following statement into IRB, then conditionally execute three different statements using regular expres- sions that search the string for the letter w, the letter z, and a number: