Regular Expressions 101

^start of line

Group 1([a-z0-9_\-%\/\/.]+\.)

Character Class[a-z0-9_\-%\/\/.]+

+matches at least one character from the set below:

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

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

_the literal _ (95₁₀ / 137₈ / 5F₁₆)

\-the literal - (45₁₀ / 55₈ / 2D₁₆)

%the literal % (37₁₀ / 45₈ / 25₁₆)

\/the literal / (47₁₀ / 57₈ / 2F₁₆)

.the literal . (46₁₀ / 56₈ / 2E₁₆)

\.the literal . (46₁₀ / 56₈ / 2E₁₆)

Group 2(jpe?g|gif|png)

1st Alternativejpe?g

jpthe literal text jp (case sensitive)

e?optionally matches the literal e (101₁₀ / 145₈ / 65₁₆) (case sensitive)

gthe literal g (103₁₀ / 147₈ / 67₁₆) (case sensitive)

2nd Alternativegif

gifthe literal text gif (case sensitive)

3rd Alternativepng

pngthe literal text png (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

Regular Expression

^([a-z0-9_\-%\/\/.]+\.)(jpe?g|gif|png)$

New

image.png
image1.png
image-1.png

error.jpg" onerror="alert('XSS')" foo="image.jp