CODEWITHSUNDEEP
regex
Abhishek Dhaduvai
Abhishek Dhaduvai

Reputation: 45

Regex for matching/extracting part of filename

The following regex

var re = /(?<=_)\d*/g

extracts the bitrate from filenames that follow a naming convention like filename_bitrate.ext

It works for most filenames -

asdfasd_400.mp4
asdfasd_600.mp3
asdfasd_1000.mxf

Some files follow the same convention but my regex can't parse them. Ex -

BLIVE_CEOFoC_210720_1245_400.mp4

I want to basically extract the number before the .ext. How do I modify my regex to work with any filename?

Upvotes: 3

Views: 47

Answers (1)

Wiktor Stribiżew
Wiktor Stribiżew

Reputation: 627607

You can use

(?<=_)\d+(?=\.\w+$)
(?<=_)\d+(?=\.[^.]+$)

See the regex demo. Details:

  • (?<=_) - a positive lookbehind that matches a location immediately preceded with a _
  • \d+ - one or more digits
  • (?=\.\w+$) - a positive lookahead that matches a location immediately followed with a dot and one or more word chars till the end of string. If you use the second version with [^.]+, it will match any one or more chars other than a dot (so, allowing any chars in the extension).

Upvotes: 2

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