What would the regex be for this?

I have this string:

videos/000/000/021/10f43ddb374开发者_C百科72ee4bb57_original.m4v

I need this part:

videos/000/000/021/

So format is:

videos/{3 digit number (000-999)}/{3 digit number (000-999)}/{3 digit number (000-999)}/

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videos/(\d{3}/){3}  

Meaning: "videos/" followed by three digits and a forward slash three times

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^videos/(\d{3})/(\d{3})/(\d{3})/

Explanation:

• \d matches a digit.
• {3} requires three of the previous item.
• ^ anchors the match at the beginning of the string so "videos/111/222/333/" matches but "othervideos/111/222/333/" does not.
• Parentheses can be used to capture the three numbers so you can examine them in a later step; in some languages they'll be available as $1, $2, and $3.

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videos/([0-9]{3}/){3}

If your regex flavor needs forward slash delimiters,

/videos\/([0-9]{3}\/){3}/