Regular Expressions 101

Community Patterns

Community Library Entry

0

Regular Expression
Python

r"
(?<!\d) (?: [0-9]{4} (?: (?:0[1-9]|1[0-2]) (?:0[1-9]|1[0-9]|2[0-8]) |(?:0[13-9]|1[0-2]) (?:29|30) |(?:0[13578]|1[02]) (?:31) ) | (?: [0-9]{2} (?: 0[48] |[2468][048] |[13579][26] ) |(?: 0[48] |[2468][048] |[13579][26] )00 ) 02 (?:29) ) (?!\d)
"
gx

Description

YYYYMMDD YYYY-MM-DD YYYY.MM.DD YYYY/MM/DD YYYY-M-D YYYY.M.D YYYY/M/D

If the sep[-./] is not given, "0" must appear before a single num. such as 20180203, 20190905. If the sep [-./] is given, the prefix 0 is optional.

Submitted by anonymous - 4 years ago