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^[0-1]?\d?\d?(\.\d?\d?)?$

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^ asserts position at start of the string

Match a single character present in the list below

[0-1]

? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

0-1 matches a single character in the range between 0 (index 48) and 1 (index 49) (case sensitive)

\d

matches a digit (equivalent to [0-9])? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

\d

matches a digit (equivalent to [0-9])? matches the previous token between zero and one times, as many times as possible, giving back as needed (greedy)

1st Capturing Group

(\.\d?\d?)?

\. matches the character . with index 46_{10} (2E_{16} or 56_{8}) literally (case sensitive)

\d

matches a digit (equivalent to [0-9])\d

matches a digit (equivalent to [0-9])$ asserts position at the end of the string, or before the line terminator right at the end of the string (if any)

Your regular expression does not match the subject string.Try launching the debugger to find out why.

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