Regular Expressions 101

Pro

^start of line

Negative Lookahead(?!.*(?:\.(?:exe|sh|js|bat)(?:\.|$)))

.*any character (except for line terminators), repeated any number of times

Non-Capturing Group(?:\.(?:exe|sh|js|bat)(?:\.|$))

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:exe|sh|js|bat)

1st Alternativeexe

exethe literal text exe (case sensitive)

2nd Alternativesh

shthe literal text sh (case sensitive)

3rd Alternativejs

jsthe literal text js (case sensitive)

4th Alternativebat

batthe literal text bat (case sensitive)

Non-Capturing Group(?:\.|$)

1st Alternative\.

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

2nd Alternative$

$end of line

.*any character (except for line terminators), repeated any number of times

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Non-Capturing Group(?:pdf|xls)

1st Alternativepdf

pdfthe literal text pdf (case sensitive)

2nd Alternativexls

xlsthe literal text xls (case sensitive)

$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.

26 tokens

^(?!.*(?:\.(?:exe|sh|js|bat)(?:\.|$))).*\.(?:pdf|xls)$

New

file.pdf
file.xls
i want to exclude
file.sh
file.exe
file.js
 or 
file.bat
filename.exe.pdf

file.pdf
file.xls
i want to exclude
file.sh
file.exe
file.js
 or 
file.bat
filename.exe.pdf