Regular Expressions 101

(?i)applies the following effective flags to the remainder of the pattern: gmi

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

Positive Lookbehind(?<=\d-)

\da digit

-the literal - (45₁₀ / 55₈ / 2D₁₆)

Group imagenum(?<imagenum>\d+)

\d+a digit, repeated at least once

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

jpgthe literal text jpg (case insensitive)

$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

(?i)(?<=\d-)(?<imagenum>\d+)\.jpg$

New

C2-123-1.JPG
C2-123-2.JPG
C2-123-3.JPG
C3-333-1.JPG
C3-333-2.JPG
C3-333-4.JPG
C3-333-999.JPG
C3-456-2.JPG
C3-111-2.JPG
C3-999-4.JPG

C2-123-1.JPG
C2-123-2.JPG
C2-123-3.JPG
C3-333-1.JPG
C3-333-2.JPG
C3-333-4.JPG
C3-333-999.JPG
C3-456-2.JPG
C3-111-2.JPG
C3-999-4.JPG