regex for integer and .0 number

I need regex for integer number or decimal number with .0

approved:
35
35.0

not approved:
any other decimal (35.7, 35.989)

>Solution :

One way:

^\d+(?:\.0)?$

• ^ – start of line anchor
• \d+ – one or more digits
• (?: – start of non-capturing group
  • \.0 – A literal . followed by 0
• ) – end of non-capturing group
• ? – 0 or 1 match of the previous match (the non-capturing group matching on \.0)
• $ – end of line anchor

Demo