Regular Expressions 101

file_the literal text file_ (case insensitive)

\d+a digit, repeated at least once

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Non-Capturing Group(?:(?!\.txt).)*

*repeats the group contents below any number of times:

Negative Lookahead(?!\.txt)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

txtthe literal text txt (case insensitive)

.any character (except for line terminators)

_sthe literal text _s (case insensitive)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

txtthe literal text txt (case insensitive)

Global pattern flags

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

i modifier: insensitive. Matches without distinguishing uppercase and lowercase letters

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

file_\d+_(?:(?!\.txt).)*_s\.txt

New

xxxxxxx File_6547845_Whateverishere_S_Md.Txt yyyyyyyyyyyyy File_14787547_Whatever is here_S.Txt zzzzzzzzzzzzz
File_6547845_Whateverishere_S_Md.Txt yyyyyyyyyyyyy File_14787547_Whatever i shere_S.Txt