regex number between 1-100 in javascript

Here's a regex pattern in JavaScript that matches numbers between 1 and 100:

index.tsx
/(^[1-9][0-9]?$|^100$)/
24 chars
2 lines

Explanation of the pattern:

• / delimits the start and end of the regex pattern
• ^ matches the beginning of the string
• $ matches the end of the string
• | acts as an OR operator
• [1-9][0-9]? matches a number between 1 and 99
  • [1-9] matches any digit between 1 and 9
  • [0-9]? matches any digit between 0 and 9, with the question mark making it optional
• ^100$ matches the number 100 exactly