[R] Pattern Matching Replacement

[ppatel3026]

I would like to replace "\r\n" with "" in a character string, where "\r\n"
exists only between < and >, how could I do that? 

Initial:
characterString = "<XML><tag1
id=\"F\r\n2\"></t\r\nag1>\r\n<tag\r\n2></tag2></XML>"

Result:
characterString = "<XML><tag1 id=\"F2\"></tag1>\r\n<tag2></tag2></XML>"

Tried with sub(below) but it only replaces the first instance and I am not
sure how to pattern match so that it only replaces \r\n that exist within
tags(< and >).  

sub("\r\n", "", charStream)
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