When escaping the $ character using R's sub function as in sub('\\$', '', '$1.99') why is it necessary to use a double back slash?
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dsaxton
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1Because "\" is a metacharacter in R too, so it too needs to be escaped. – joran Mar 29 '16 at 01:21
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1e.g http://stackoverflow.com/q/11806501/324364 or (my favorite) http://stackoverflow.com/questions/14879204/how-to-escape-a-backslash-in-r#comment20862252_14879204 – joran Mar 29 '16 at 01:24
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Interesting, but it is escaped using the backslash itself? – dsaxton Mar 29 '16 at 01:24
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1Yes, in R strings every two backslashes equals one. – joran Mar 29 '16 at 01:26