Regular Expressions 101

Character Class[_]

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 1(\d{1,4})

\d{1,4}a digit, repeated between 1 and 4 times

Character Class[.]

.the literal . (46₁₀ / 56₈ / 2E₁₆)

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.

Search reference

Regular Expression

[_](\d{1,4})[.]

1234test.mp3
999test.mp3
12test.mp3
0test.mp3
0test.mp34
test1234.mp3
@test.mp3
/test.mp3
\\test.mp3
test_1.mp3