Precise Python time Regular Expression matching method analysis, python matching

Precise Python time Regular Expression matching method analysis, python matching

This example describes the exact Regular Expression matching method for Python time. We will share this with you for your reference. The details are as follows:

It is not easy to use regular expressions to accurately match the time.

Method 1:

>>> import re>>> t = '19:10:48'>>> m = re.match(r'(.*):(.*):(.*)', t)>>> m.groups()('19', '10', '48')

Method 2:

>>> t = '19:10:48'>>> m = re.match(r'(\d{2}):(\d{2}):(\d{2})', t)>>> m.groups()('19', '10', '48')

For example, the above is not accurate matching, for example, 24: 61: 61 obviously does not meet the requirements.

Hour (H), 0-23
Minute (M), 0-59
Seconds (S), 0-59
Precise matching of hours is as follows: 0? [0-9] | 1 [0-9] | 2 [0-3]
Accurate match in minutes: 0? [0-9] | [1-5] [0-9]
The exact match in seconds is as follows: 0? [0-9] | [1-5] [0-9]

The complete regular expression match is:

>>> t = '23:59:08'>>> p = re.compile(r'^(0?[0-9]|1[0-9]|2[0-3]):(0?[0-9]|[1-5][0-9]):(0?[0-9]|[1-5][0-9])$')>>> s = p.search(t)>>> s.groups()('23', '59', '08')

PS: here we will provide two very convenient Regular Expression tools for your reference:

JavaScript Regular Expression online testing tool:
Http://tools.jb51.net/regex/javascript

Regular Expression generation tool:
Http://tools.jb51.net/regex/create_reg