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6 changes: 3 additions & 3 deletions strings.Rmd
Original file line number Diff line number Diff line change
Expand Up @@ -405,7 +405,7 @@ Create a regular expression that will match telephone numbers as commonly writte

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This answer can be improved and expanded.
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Expand Down Expand Up @@ -618,8 +618,8 @@ The answer to each part follows.
Construct regular expressions to match words that:

1. Start and end with the same character.
1. Contain a repeated pair of letters (e.g. ``church'' contains ``ch'' repeated twice.)
1. Contain one letter repeated in at least three places (e.g. ``eleven'' contains three ``e''s.)
1. Contain a repeated pair of letters (e.g. ``church`` contains ''ch'' repeated twice.)
1. Contain one letter repeated in at least three places (e.g. ``eleven`` contains three ''e''s.)

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2 changes: 1 addition & 1 deletion tidy.Rmd
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Expand Up @@ -121,7 +121,7 @@ made it easy to divide cases by population.
However, we had to repeat this calculation for each row.

The ideal format of a data frame to answer this question is one with columns `country`, `year`, `cases`, and `population`.
Then problem could be answered with a single `mutate()` call.
Then, the problem could be answered with a single `mutate()` call.

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