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Hexadecimal Number
\b
0
[xX]
[0-9a-fA-F]
+
\b
Assert position at a word boundary
Match the character "0" literally
Match a single character out of the list: one of the characters "xX"
Match a single character out of the list: in the range between 0 and 9, or in the range between a and f, or in the range between A and F
Between one and unlimited times, as many times as possible, giving back as needed (greedy)
Assert position at a word boundary
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