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st: Regular Expression Double Escape: \\


From   Steven Samuels <samplerx@earthlink.net>
To   statalist@hsphsun2.harvard.edu
Subject   st: Regular Expression Double Escape: \\
Date   Fri, 31 Oct 2008 11:43:17 -0400

In http://www.stata.com/statalist/archive/2005-09/msg00364.html,   
Frank de Libero posted a summary of Stata's implementation of regular  
expressions  which he had received from Kevin Turner of StataCorp.   
It contained the statement that "... denoting a literal dollar sign  
could be done with \$"

This was incorrect.  "$" is a reserved Stata character--it is used in  
the definition of global macros.
To match a literal dollar sign, one needs a double backslash, "\\$".

Thanks to Kerry Kammire of StataCorp for setting me straight.

-Steve


**************************CODE BEGINS**************************
input str10 item
"$10,000"
end

gen str10 item_w = regexr(item,"\\$","A")   //Matches literal "$"
gen str10 item_x = regexr(item,"\$","A")    //Matches end position
gen str10 item_y = regexr(item,"$","A")     //Matches end position
list
***************************CODE ENDS***************************


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