fix(dateFilter): correctly handle newlines in format string

Fixes angular#15794

Closes angular#15792

Author: ashsearle

src/ng/filter/filters.js

@@ -475,7 +475,7 @@ var DATE_FORMATS = {
      GGGG: longEraGetter
 };
 
-var DATE_FORMATS_SPLIT = /((?:[^yMLdHhmsaZEwG']+)|(?:'(?:[^']|'')*')|(?:E+|y+|M+|L+|d+|H+|h+|m+|s+|a|Z|G+|w+))(.*)/,
+var DATE_FORMATS_SPLIT = /((?:[^yMLdHhmsaZEwG']+)|(?:'(?:[^']|'')*')|(?:E+|y+|M+|L+|d+|H+|h+|m+|s+|a|Z|G+|w+))([\s\S]*)/,
     NUMBER_STRING = /^-?\d+$/;
 
 /**
@@ -534,6 +534,8 @@ var DATE_FORMATS_SPLIT = /((?:[^yMLdHhmsaZEwG']+)|(?:'(?:[^']|'')*')|(?:E+|y+|M+
  *   `"h 'in the morning'"`). In order to output a single quote, escape it - i.e., two single quotes in a sequence
  *   (e.g. `"h 'o''clock'"`).
  *
+ *   Any other characters in the `format` string will be output as-is.
+ *
  * @param {(Date|number|string)} date Date to format either as Date object, milliseconds (string or
  *    number) or various ISO 8601 datetime string formats (e.g. yyyy-MM-ddTHH:mm:ss.sssZ and its
  *    shorter versions like yyyy-MM-ddTHH:mmZ, yyyy-MM-dd or yyyyMMddTHHmmssZ). If no timezone is

test/ng/filter/filtersSpec.js

@@ -504,6 +504,10 @@ describe('filters', function() {
       expect(date(morning, 'yy/xxx')).toEqual('10/xxx');
     });
 
+    it('should allow newlines in format', function() {
+      expect(date(midnight, 'EEE\nMMM d\'\n\'yy/xxx\n')).toEqual('Fri\nSep 3\n10/xxx\n');
+    });
+
     it('should support various iso8061 date strings with timezone as input', function() {
       var format = 'yyyy-MM-dd ss';