regex101: PCRE (Legacy) Substitution Workspace

1st Alternative^[^_]*_

^start of line

Negated Character Class[^_]*

*matches any number of characters outside the set below:

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

2nd Alternative_\d+_\d+\.[^.]*$

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\d+a digit, repeated at least once

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Negated Character Class[^.]*

*matches any number of characters outside the set below:

.the literal . (46₁₀ / 56₈ / 2E₁₆)

$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

25 tokens

Regular Expression

^[^_]*_|_\d+_\d+\.[^.]*$

New

Doc20191001119049_fotocontargasx_3962122_943000.jpg
Doc201810011052053_fotoAssicurazioneCartaceo_3962128_943000.jpg
Doc201910011214020_fotoesterna_ant_396024_947112.jpg
Doc201710071149010_foto_TargaMid_4007396_95010.jpg

Substitution

Doc20191001119049_fotocontargasx_3962122_943000.jpg
Doc201810011052053_fotoAssicurazioneCartaceo_3962128_943000.jpg
Doc201910011214020_fotoesterna_ant_396024_947112.jpg
Doc201710071149010_foto_TargaMid_4007396_95010.jpg