How can I get some text from string like AB_CD_9.9.9_Sometext

How Can I get
only 9.9.9 from string "AB_CD_9.9.9_Sometext" with powershell and regular expression?
Thank you,
Lei

This works.
if('AB_CD_9.9.9_Sometext' -match '\d\.\d\.\d'){$matches[0]}else{'notfound'}
¯\_(ツ)_/¯

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flags=296,maximumSize=,minimumSize=,preferredSize=,defaultIcon=,disabledIcon=,
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