trying to switch out addresses that have double directions, such as the
following example:

a = "S S Main St & Interstate 95"

a = gsub(pattern="S S ", replacement="S ", a)


… the problem is that I don't want to affect instances where this might be
a correct address such as the following:


"3421 BIGS St"


what I want to say is switch out only if this is either of the following
situations


[beginning of char]S S"

" S S "

"S S[end of char]


Is there anyway of making gsub or a similar function make the replacements
I want?  Thanks in advance for your help.


~Markus

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