added RegexField

docs/api-guide/fields.md

@@ -141,6 +141,16 @@ A text representation, validates the text to be a valid e-mail address.
 
 Corresponds to `django.db.models.fields.EmailField`
 
+## RegexField
+
+A text representation, that validates the given value matches against a certain regular expression.
+
+Uses Django's `django.core.validators.RegexValidator` for validation.
+
+Corresponds to `django.forms.fields.RegexField`
+
+**Signature:** `RegexField(regex, max_length=None, min_length=None)`
+
 ## DateField
 
 A date representation.

docs/topics/release-notes.md

@@ -7,6 +7,7 @@
 ## Master
 
 * Support for `read_only_fields` on `ModelSerializer` classes.
+* Added `RegexField`.
 
 ## 2.1.2
 

rest_framework/fields.py

 import copy
 import datetime
 import inspect
+import re
 import warnings
 
 from django.core import validators
@@ -768,6 +769,34 @@ class EmailField(CharField):
         return result
 
 
+class RegexField(CharField):
+    type_name = 'RegexField'
+
+    def __init__(self, regex, max_length=None, min_length=None, *args, **kwargs):
+        super(RegexField, self).__init__(max_length, min_length, *args, **kwargs)
+        self.regex = regex
+
+    def _get_regex(self):
+        return self._regex
+
+    def _set_regex(self, regex):
+        if isinstance(regex, basestring):
+            regex = re.compile(regex)
+        self._regex = regex
+        if hasattr(self, '_regex_validator') and self._regex_validator in self.validators:
+            self.validators.remove(self._regex_validator)
+        self._regex_validator = validators.RegexValidator(regex=regex)
+        self.validators.append(self._regex_validator)
+
+    regex = property(_get_regex, _set_regex)
+
+    def __deepcopy__(self, memo):
+        result = copy.copy(self)
+        memo[id(self)] = result
+        result.validators = self.validators[:]
+        return result
+
+
 class DateField(WritableField):
     type_name = 'DateField'