how to match a number which is less than or equal to 100?

by

Try this

\b(0*(?:[1-9][0-9]?|100))\b

Explanation

"
\b                # Assert position at a word boundary
(                 # Match the regular expression below and capture its match into backreference number 1
   0              # Match the character “0” literally
      *           # Between zero and unlimited times, as many times as possible, giving back as needed (greedy)
   (?:            # Match the regular expression below
                  # Match either the regular expression below (attempting the next alternative only if this one fails)
         [1-9]    # Match a single character in the range between “1” and “9”
         [0-9]    # Match a single character in the range between “0” and “9”
            ?     # Between zero and one times, as many times as possible, giving back as needed (greedy)
      |           # Or match regular expression number 2 below (the entire group fails if this one fails to match)
         100      # Match the characters “100” literally
   )
)
\b                # Assert position at a word boundary
"

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