Update README.md

Author: kugland

README.md

@@ -1,8 +1,8 @@
 # parse-date-regex
 
 This regex validates and parses dates in the format YYYY-MM-DD, taking into account
-the number of days in each month and leap years. Leading zeros are discarded in the
-captures.
+leap years and the number of days in each month. Leading zeros are discarded in the
+captures. Accepts dates with year in range \[0, 9999\].
 
 By removing the spaces and comments in the regex, it can be used in Javascript or any
 other language that supports PCRE (Perl-compatible regular expressions), *e.g.*: