18.30 Select Lines from File Matching Regexp
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We can select lines from a file that match a
regular expression using grep with, for example, -P
which will interpret the pattern as a Perl regular expression. For
example, the select lines from any Rmd file in the current
directory, that begin with two asterisks, then an 8 digit date, then
two more asterisks and a space, we can use:
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