c# - How to get a proper date from a text? -

i have find date text file text should int form of dd mm or mm dd (i.e. 1. 10 january or 2. january 10) have written type of regex (\d{2} january) .it gives 10 january want write
1. single regex can both date format (i have option can write same (\d{2} january)|(january \d{2}).)
2. valid date number (i.e. regex returns true if have 99 january in text invalid). cases should match

• 1 january
• 02 january
• 29 january
• 32 january
• 2004 january
• january 2004
• january 32
• january 29
• january 1
• january 01

those in bold case should valid match , other invalid.

this pattern needs month names once:

\b((?<day>[0-2]?\d|3[01]) )?january(?(day)| ([0-2]?\d|3[01]))\b 

demo

but matches days 0 31. day patterns are:

• 0-31: [0-2]?\d|3[01]
• 0-30: [0-2]?\d|30
• 0-29: [0-2]?\d
• 0-28: [01]?\d|2[0-8]