Regular expressions examples in Intro

[mightylibrarian]

Use the same term for Lines 55-59

###I think using the same term "mark" is best for lines 56 to 59, easier to compare and allows instruction to ask for other terms using terms: word, comb, and respect.

- the regular expression `mark` will match not only `mark` but also find `marking`, `market`, `unremarkable`, and so on.
- the regular expression `\bmark` will match `mark`, `marking`, and `marketable`, but not 'remark' or 'demark'.
- the regular expression `mark\b` will match `mark` and `remark` but not `market`.
- the regular expression `\bmark\b` will match `mark` but not `marking' or `unremarkable`.

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[aforestsomewhere]

I recently instructed using this lesson plan and would agree that using the same string "mark" with different possible word boundaries would improve the clarity.