Which regular expression matches 50440123 and 4044123, but not 60440123?

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answerhappygod
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Which regular expression matches 50440123 and 4044123, but not 60440123?

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Which regular expression matches 50440123 and 4044123, but not 60440123?

A. [6].*
B. [45].*
C. {6}.*
D. {45}.*
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