Add is_contained_in() as alias for in() Fix conditional. (#235)

Author: blackwinter

README.md

@@ -645,7 +645,13 @@ Executes the functions if/unless the field value does not match the regular expr
 
 #### `in`
 
-Executes the functions if/unless the field value is contained in the value of the other field.
+Executes the functions if/unless the field value [is contained in](https://perldoc.perl.org/perlop#Smartmatch-Operator) the value of the other field.
+
+_Also aliased as [`is_contained_in`](#is_contained_in)._
+
+#### `is_contained_in`
+
+_Alias for [`in`](#in)._
 
 ## Xtext
 

metafix/src/main/java/org/metafacture/metafix/FixConditional.java

@@ -89,6 +89,12 @@ public boolean test(final Metafix metafix, final Record record, final List<Strin
             );
         }
     },
+    is_contained_in {
+        @Override
+        public boolean test(final Metafix metafix, final Record record, final List<String> params, final Map<String, String> options) {
+            return in.test(metafix, record, params, options);
+        }
+    },
 
     all_match {
         @Override