Regular Expressions 101

Pro

Positive Lookbehind(?<=_)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\d+a digit, repeated at least once

Positive Lookahead(?=\.\w+$)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

\w+any word character, repeated at least once

$end of line

Global pattern flags

g modifier: global. Finds all matches instead of stopping after the first

m modifier: multiline. Causes ^ and $ to match the start and end of each line, not only the start and end of the string

Detailed match information will be displayed here automatically.

25 tokens

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

asdfasd_400.mp4
asdfasd_600.mp3
asdfasd_1000.mxf
BLIVE_CEOFoC_210720_1245_400.mp4

asdfasd_400.mp4
asdfasd_600.mp3
asdfasd_1000.mxf
BLIVE_CEOFoC_210720_1245_400.mp4