Javascript Decimal Place Restriction To Specific Number With Regex

Question

I have some client-side validation against a input type number which

• Will accept any number 0 through 99 with 2 decimal places
• And the values of the decimals must be .00, .25, .33, .5, .67, .75

I've tried with 2 digit length validation but how can I validate specific list of decimal numbers with regex ?

/^\d{1,2}(\.\d{1,2})?$/

VALID CASES

5.25

78.5

99.75

INVALID CASES

88.12

50.78

Answer 1

You could write the pattern as:

^\d{1,2}\.(?:00|[72]5|33|67|50?)$

Explanation

• ^ Start of string
• \d{1,2} Match 1 or 2 digits
• \. Match a dot
• (?: Non capture group for the alternatives
  • 00|[72]5|33|67|50? match 00 75 25 33 67 5 or 50
• ) Close the non capture group
• $ End of string

Regex demo