Regular Expressions 101

Pro

SECONDNAMEthe literal text SECONDNAME (case sensitive)

Character Class[1-3]

1-3one character from 1 (49₁₀) to 3 (51₁₀)

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

Global pattern flags

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

Detailed match information will be displayed here automatically.

25 tokens

SECONDNAME[1-3]_

New

FILENAME_SECONDNAME1_DS.txt
FILENAME_SECONDNAME3_DS.txt
FILENAME_SECONDNAME8_DS.txt

FILENAME_SECONDNAME1_DS.txt
FILENAME_SECONDNAME3_DS.txt
FILENAME_SECONDNAME8_DS.txt