Update API.md

Add note about xregexp
formsy · Dec 29, 2016 · f395839 · f395839
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diff --git a/API.md b/API.md
@@ -659,6 +659,8 @@ Formsy.addValidationRule('isMoreThan', function (values, value, otherField) {
 ```
 Returns true if the value is thruthful
 
+_For more complicated regular expressions (emoji, international characters) you can use [xregexp](https:/slevithan/xregexp). See [this comment](https:/christianalfoni/formsy-react/issues/407#issuecomment-266306783) for an example._
+
 **isEmail**
 ```jsx
 <MyInputComponent name="foo" validations="isEmail"/>