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14.4 exercise of Detect matches should be 4th level heading (#727)

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Zhuoer Dong 2018-11-12 23:55:21 +08:00 committed by Hadley Wickham
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strings.Rmd
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@ -612,7 +612,7 @@ str_view_all("abababa", "aba")
Note the use of `str_view_all()`. As you'll shortly learn, many stringr functions come in pairs: one function works with a single match, and the other works with all matches. The second function will have the suffix `_all`.
### Exercises
#### Exercises
1. For each of the following challenges, try solving it by using both a single
regular expression, and a combination of multiple `str_detect()` calls.