Regular Expressions 101

Pro

(?s)applies the following effective flags to the remainder of the pattern: gms

s modifier: single line. Allows a dot to match line terminators

\hany horizontal whitespace character

Group 1([a-zA-Z0-9]{8})

Character Class[a-zA-Z0-9]{8}

{8}matches exactly 8 characters from the set below:

a-zone character from a (97₁₀) to z (122₁₀) (case sensitive)

A-Zone character from A (65₁₀) to Z (90₁₀) (case sensitive)

0-9one character from 0 (48₁₀) to 9 (57₁₀)

$end of line

Positive Lookahead(?=.*\h\1$)

.*any character, repeated any number of times

\hany horizontal whitespace character

\1the text saved by group 1

$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

Regular Expression

(?s)\h([a-zA-Z0-9]{8})$(?=.*\h\1$)

New

Folder A\Folder C\File three.txt         56efd95f
Folder A\File one.txt                    b8e1b873
Folder A\Folder B\Folder D\File four.txt 56efd95f
Folder A\Folder B\File two.txt           21e8e9c9

Extraction

Folder A\Folder C\File three.txt         56efd95f
Folder A\File one.txt                    b8e1b873
Folder A\Folder B\Folder D\File four.txt 56efd95f
Folder A\Folder B\File two.txt           21e8e9c9