Regular Expression Tutorial 2: Commands in R

Bioinfomagician

The second part of the tutorial for regular expression will cover common commands used in R together with regular expression. Once you know how to write a regular expression to match a string, you may want to manipulate strings such as deletion or replacing. Here is the list of string matching &manipulation commands commonly used with regular expressions in R. These commands also appear in many other languages.

Command          Function grep( )          Return index of the object where reg exp found the string grepl( ) Return logical values for reg exp matching regexpr( ) Return the first position of found string by reg exp gregexpr( ) Return all positions of found string by regexp sub( ) Substitute a pattern with a given string (first occurrence only) gsub( ) Globally substitute a pattern with a given string (all occurrences) substr( ) Return the substring in the giving character positions (start and…

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