diff --git a/src/prettify/parser/Prettify.java b/src/prettify/parser/Prettify.java
index 2abcaff..622b2d8 100644
--- a/src/prettify/parser/Prettify.java
+++ b/src/prettify/parser/Prettify.java
@@ -677,8 +677,8 @@
        * @const
        */
       // Javascript treat true as 1
-      String regexExcls = (regexLiterals instanceof Boolean ? 1 : (Integer) regexLiterals) > 1 
-              ? ""  // Multiline regex literals
+      String regexExcls = Util.getVariableValueAsInteger(regexLiterals) > 1
+              ? "" // Multiline regex literals
               : "\n\r";
       /**
        * @const
diff --git a/src/prettify/parser/Util.java b/src/prettify/parser/Util.java
index 419d955..4613ef8 100644
--- a/src/prettify/parser/Util.java
+++ b/src/prettify/parser/Util.java
@@ -30,6 +30,34 @@
 
   protected Util() {
   }
+  
+  /**
+   * Treat a variable as an integer in JavaScript style. Note this function can
+   * only handle integer and boolean currently.
+   *
+   * @param var the variable to get value from
+   * @return the integer value
+   * @throws IllegalArgumentException the data type of {@code var} is neither
+   * integer nor boolean.
+   */
+  public static Integer getVariableValueAsInteger(Object var) {
+    if (var == null) {
+      throw new NullPointerException("argument 'var' cannot be null");
+    }
+
+    Integer returnResult = -1;
+
+    if (var instanceof Integer) {
+      returnResult = (Integer) var;
+    } else if (var instanceof Boolean) {
+      // Javascript treat true as 1
+      returnResult = (Boolean) var ? 1 : 0;
+    } else {
+      throw new IllegalArgumentException("'var' is neither integer nor boolean");
+    }
+
+    return returnResult;
+  }
 
   /**
    * Get all the matches for {@code string} compiled by {@code pattern}. If