Refactor addCommandComplete

Refactors addCommandComplete to tighten parsing regex start anchor and
handle edge case where no row count is specified (pre 8.2 COPY).

Author: sehrope

lib/result.js

@@ -27,7 +27,7 @@ var Result = function (rowMode) {
   }
 }
 
-var matchRegexp = /([A-Za-z]+) ?(\d+ )?(\d+)?/
+var matchRegexp = /^([A-Za-z]+)(?: (\d+))?(?: (\d+))?/
 
 // adds a command complete message
 Result.prototype.addCommandComplete = function (msg) {
@@ -41,12 +41,12 @@ Result.prototype.addCommandComplete = function (msg) {
   }
   if (match) {
     this.command = match[1]
-    // match 3 will only be existing on insert commands
     if (match[3]) {
-      // msg.value is from native bindings
-      this.rowCount = parseInt(match[3] || msg.value, 10)
+      // COMMMAND OID ROWS
       this.oid = parseInt(match[2], 10)
-    } else {
+      this.rowCount = parseInt(match[3], 10)
+    } else if (match[2]) {
+      // COMMAND ROWS
       this.rowCount = parseInt(match[2], 10)
     }
   }

test/unit/client/result-metadata-tests.js

@@ -35,3 +35,5 @@ testForTag('INSERT 841 1', check(841, 1, 'INSERT'))
 testForTag('DELETE 10', check(null, 10, 'DELETE'))
 testForTag('UPDATE 11', check(null, 11, 'UPDATE'))
 testForTag('SELECT 20', check(null, 20, 'SELECT'))
+testForTag('COPY', check(null, null, 'COPY'))
+testForTag('COPY 12345', check(null, 12345, 'COPY'))