diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java
index 0e3c3a34ef9..bf58bd1cc36 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/DefaultCodegen.java
@@ -63,7 +63,7 @@ import java.util.regex.Pattern;
 
 
 public class DefaultCodegen {
-    private static final Logger LOGGER = LoggerFactory.getLogger(DefaultCodegen.class);
+    protected static final Logger LOGGER = LoggerFactory.getLogger(DefaultCodegen.class);
 
     protected String outputFolder = "";
     protected Set<String> defaultIncludes = new HashSet<String>();
diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PerlClientCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PerlClientCodegen.java
index 80f83bc2d10..d54c44a9bdd 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PerlClientCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PerlClientCodegen.java
@@ -159,15 +159,17 @@ public class PerlClientCodegen extends DefaultCodegen implements CodegenConfig {
 
     @Override
     public String toVarName(String name) {
+        // return the name in underscore style
+        // PhoneNumber => phone_number
+        name = underscore(name);
+
         // parameter name starting with number won't compile
         // need to escape it by appending _ at the beginning
-        if (name.matches("^[0-9]")) {
+        if (name.matches("^\\d.*")) {
             name = "_" + name;
         }
 
-        // return the name in underscore style
-        // PhoneNumber => phone_number
-        return underscore(name);
+        return name;
     }
 
     @Override
diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PhpClientCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PhpClientCodegen.java
index 44284492172..eaf758cf1c4 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PhpClientCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/PhpClientCodegen.java
@@ -284,15 +284,17 @@ public class PhpClientCodegen extends DefaultCodegen implements CodegenConfig {
 
     @Override
     public String toVarName(String name) {
+        // return the name in underscore style
+        // PhoneNumber => phone_number
+        name =  underscore(name);
+
         // parameter name starting with number won't compile
         // need to escape it by appending _ at the beginning
-        if (name.matches("^[0-9]")) {
+        if (name.matches("^\\d.*")) {
             name = "_" + name;
         }
 
-        // return the name in underscore style
-        // PhoneNumber => phone_number
-        return underscore(name);
+        return name;
     }
 
     @Override
diff --git a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/SilexServerCodegen.java b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/SilexServerCodegen.java
index 6b0bf895b4a..8bd4d627d56 100644
--- a/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/SilexServerCodegen.java
+++ b/modules/swagger-codegen/src/main/java/io/swagger/codegen/languages/SilexServerCodegen.java
@@ -154,15 +154,17 @@ public class SilexServerCodegen extends DefaultCodegen implements CodegenConfig
 
     @Override
     public String toVarName(String name) {
+        // return the name in underscore style
+        // PhoneNumber => phone_number
+        name = underscore(name);
+
         // parameter name starting with number won't compile
         // need to escape it by appending _ at the beginning
-        if (name.matches("^[0-9]")) {
+        if (name.matches("^\\d.*")) {
             name = "_" + name;
         }
 
-        // return the name in underscore style
-        // PhoneNumber => phone_number
-        return underscore(name);
+        return name;
     }
 
     @Override