Initial data commit

Task/URL-decoding/REXX/url-decoding-2.rexx

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+/*REXX program converts a   URL─encoded string  ──►  its original unencoded form.       */
+url.1='http%3A%2F%2Ffoo%20bar%2F'
+url.2='mailto%3A%22Ivan%20Aim%22%20%3Civan%2Eaim%40email%2Ecom%3E'
+url.3='%6D%61%69%6C%74%6F%3A%22%49%72%6D%61%20%55%73%65%72%22%20%3C%69%72%6D%61%2E%75%73%65%72%40%6D%61%69%6C%2E%63%6F%6D%3E'
+URLs =3
+            do j=1  for URLs
+            say url.j
+            say decodeURL(url.j)
+            say
+            end   /*j*/
+exit
+/*──────────────────────────────────────────────────────────────────────────────────────*/
+decodeURL:  procedure;  parse arg encoded;     decoded= ''
+
+              do  while encoded\==''
+              parse var encoded   head  '%'  +1  code  +2  tail
+              decoded= decoded || head
+              L= length( strip( code, 'T') )
+                 select
+                 when L==2 & datatype(code, "X")  then       decoded= decoded || x2c(code)
+                 when L\==0                       then do;   decoded= decoded'%'
+                                                             tail= code || tail
+                                                       end
+                 otherwise nop
+                 end    /*select*/
+              encoded= tail
+              end   /*while*/
+
+            return decoded