Regular Expressions 101

Pro

^start of line

Group 1(\w+_)

\w+any word character, repeated at least once

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 2(\w+_)

\w+any word character, repeated at least once

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Group 3(.*)

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

Group 4(\.txt)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

txtthe literal text txt (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.

25 tokens

^(\w+_)(\w+_)(.*)(\.txt)$

New

FILENAME_SECONDNAME1_DS.txt
FILENAME_SECONDNAME2_DS.txt
FILENAME_SECONDNAME3_DS.txt
FILENAME_SECONDNAME4_ER.txt
FILENAME_SECONDNAME5_ER.txt

FILENAME_SECONDNAME1_DS.txt
FILENAME_SECONDNAME2_DS.txt
FILENAME_SECONDNAME3_DS.txt
FILENAME_SECONDNAME4_ER.txt
FILENAME_SECONDNAME5_ER.txt