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R Programming for Bioinformatics
book

R Programming for Bioinformatics

by Robert Gentleman
July 2008
Intermediate to advanced content levelIntermediate to advanced
328 pages
10h 53m
English
Chapman and Hall/CRC
Content preview from R Programming for Bioinformatics
Working with Character Data 165
? The preceding item is optional and will be matched at most once.
* The preceding item will be matched zero or more times.
+ The preceding item will be matched one or more times.
{n} The preceding item is matched exactly n times.
{n,} The preceding item is matched n or more times.
{n,m} The preceding item is matched at least n times,
but not more than m times.
Table 5.2: Repetition operators for regular expressions.
5.3.1.3 Quantifiers
While matching specific patterns is often all that is needed, there are many
cases where special handling of repeated instances of the regular expres-
sion is useful. For example, one can
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Publisher Resources

ISBN: 9781420063677