Regex To Match A Valid Day In A Date String

A regular expression to match a valid day in a date string (from 1 to 31).

/(0[1-9]|[12]\d|3[01])/g

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Matches:

• 01
• 31
• 29

Use this regex instead if you don’t want days with a preceding zero.

/([1-9]|[12]\d|3[01])/g

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Matches:

• 1
• 31
• 29

See Also:

• Date (dd/mm/yyyy) Regular Expression
• 12-Hour Time (hh:mm:ss) Regular Expression
• 24-Hour Time (HH:mm:ss) Regular Expression
• Month Regular Expression
• Regular Expression To Match Names Of The Days Of The Week
• Regular Expression To Match Month Name
• Regular Expression For Year