move axis range/autorange/domain regex to module scope

Author: etpinard

src/plot_api/plot_api.js

@@ -1721,6 +1721,10 @@ exports.relayout = function relayout(gd, astr, val) {
     });
 };
 
+var AX_RANGE_RE = /^[xyz]axis[0-9]*\.range(\[[0|1]\])?$/;
+var AX_AUTORANGE_RE = /^[xyz]axis[0-9]*\.autorange$/;
+var AX_DOMAIN_RE = /^[xyz]axis[0-9]*\.domain(\[[0|1]\])?$/;
+
 function _relayout(gd, aobj) {
     var layout = gd.layout,
         fullLayout = gd._fullLayout,
@@ -1834,11 +1838,11 @@ function _relayout(gd, aobj) {
             fullLayout[ai] = gd._initialAutoSize[ai];
         }
         // check autorange vs range
-        else if(pleafPlus.match(/^[xyz]axis[0-9]*\.range(\[[0|1]\])?$/)) {
+        else if(pleafPlus.match(AX_RANGE_RE)) {
             recordAlteredAxis(pleafPlus);
             Lib.nestedProperty(fullLayout, ptrunk + '._inputRange').set(null);
         }
-        else if(pleafPlus.match(/^[xyz]axis[0-9]*\.autorange$/)) {
+        else if(pleafPlus.match(AX_AUTORANGE_RE)) {
             recordAlteredAxis(pleafPlus);
             Lib.nestedProperty(fullLayout, ptrunk + '._inputRange').set(null);
             var axFull = Lib.nestedProperty(fullLayout, ptrunk).get();
@@ -1848,7 +1852,7 @@ function _relayout(gd, aobj) {
                 axFull._input.domain = axFull._inputDomain.slice();
             }
         }
-        else if(pleafPlus.match(/^[xyz]axis[0-9]*\.domain(\[[0|1]\])?$/)) {
+        else if(pleafPlus.match(AX_DOMAIN_RE)) {
             Lib.nestedProperty(fullLayout, ptrunk + '._inputDomain').set(null);
         }