What is the regular expression to match numbers from 0 to 999, including those with a leading 0?

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The regular expression to match numbers from 0 to 999, including those with a leading 0 is:

\b(0*\d{1,2}|[1-9]\d{0,2})\b

Explanation:

• \b is used to indicate word boundaries to ensure that the expression only matches numbers and not parts of larger numbers.
• 0*\d{1,2} matches numbers with a leading 0 (if any) and 1 or 2 additional digits.
• [1-9]\d{0,2} matches numbers that don't have a leading 0 and have 1, 2, or 3 digits.

Together, the two options cover all possible numbers from 0 to 999.