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Update strings.Rmd (#262) 

Typo
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S'busiso Mkhondwane 2016-08-15 14:32:17 +02:00 committed by Hadley Wickham
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@ -279,7 +279,7 @@ You can also match the boundary between words with `\b`. I don't often use this
### Character classes and alternatives ### Character classes and alternatives
There are number of special patterns that match more than one character. You've already seen `.`, which matches any character apart from a newline. There are four other useful tools: There are a number of special patterns that match more than one character. You've already seen `.`, which matches any character apart from a newline. There are four other useful tools:
* `\d`: matches any digit. * `\d`: matches any digit.
* `\s`: matches any whitespace (e.g. space, tab, newline). * `\s`: matches any whitespace (e.g. space, tab, newline).