Regular Expression Lab                

In this lab, you will gain practice using regular expressions. A skeleton source file is in ~cs253/Lab/Regex/regex.cc. Copy it to a convenient directory and modify it during this lab.                 

Template                

The file ~cs253/Lab/Regex/regex.cc contains:

Exercises                

regex.cc contains a number of calls to the function test(), which takes a regular expression, matches it against the string A quick brown fox jumps over the lazy dog, and displays the location and text of any match.                 

You will replace each placeholder regular expression "regex goes here" with a regular expression that performs the task described in the previous lines. The first exercise is already done.                 

• Write a general-purpose regular expression to accomplish the given task. For example, if I asked you to match a three-letter word, you shouldn’t look at the sample sentence, decide that “fox” is a three letter word, and then write the regular expression "fox". I want the computer doing the pattern matching, not you.
• For example, in exercise #1, test() should produce this output:

    1: pattern="jump" target="A quick brown fox jumps over the lazy dog"
       at 18: "jump"

The 18 means that “jump” was found at offset 18 of the target string.

• Refer to the Regular Expressions lecture as needed.
• Remember, backslashes (\) are special in C++ strings. To get an actual backslash into a C++ string, you must double it (\\).
• If your regular expression contains many doubled backslashes, consider using a R"(raw string)" so you don’t have to double the backslashes.
• When you’re done, copy regex.cc to recit15.txt so you can turn it in. Inspect your recit15.txt to ensure that it contains what you want.

How to submit your work:                

Use web checkin, or Linux checkin:                 

    ~cs253/bin/checkin RECIT15 recit15.txt

How to receive negative points:                

Turn in someone else’s work.