NSIS: Update regex for constants pattern (#3267)

Author: idleberg

components/prism-nsis.js

@@ -1,21 +1,25 @@
 $(myLicenseData)
 $(^Name)
+$(!Name)
 ${LANG_ENGLISH}
 ${AtLeastWin8.1}
 ${nsArray_Copy}
 ${xml::CreateNode}
 ${^EXAMPLE}
+${!defineifexist}
 
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 [
     ["constant", "$(myLicenseData)"],
     ["constant", "$(^Name)"],
+    ["constant", "$(!Name)"],
     ["constant", "${LANG_ENGLISH}"],
     ["constant", "${AtLeastWin8.1}"],
     ["constant", "${nsArray_Copy}"],
     ["constant", "${xml::CreateNode}"],
-    ["constant", "${^EXAMPLE}"]
+    ["constant", "${^EXAMPLE}"],
+    ["constant", "${!defineifexist}"]
 ]
 
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