Regular Expressions 101

Pro

^start of string

Non-Capturing Group(?:[[:xdigit:]]{2}([-:]))

Character Class[[:xdigit:]

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case sensitive)

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case sensitive)

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

tthe literal t (116₁₀ / 164₈ / 74₁₆) (case sensitive)

]{2}the literal ] (93₁₀ / 135₈ / 5D₁₆) , repeated exactly 2 times

Group 1([-:])

Character Class[-:]

-the literal - (45₁₀ / 55₈ / 2D₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

Non-Capturing Group(?:[[:xdigit:]]{2}\1){4}

{4}repeats the group contents below exactly 4 times:

Character Class[[:xdigit:]

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case sensitive)

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case sensitive)

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

tthe literal t (116₁₀ / 164₈ / 74₁₆) (case sensitive)

]{2}the literal ] (93₁₀ / 135₈ / 5D₁₆) , repeated exactly 2 times

\1the text saved by group 1

Character Class[[:xdigit:]

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

:the literal : (58₁₀ / 72₈ / 3A₁₆)

xthe literal x (120₁₀ / 170₈ / 78₁₆) (case sensitive)

dthe literal d (100₁₀ / 144₈ / 64₁₆) (case sensitive)

ithe literal i (105₁₀ / 151₈ / 69₁₆) (case sensitive)

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

tthe literal t (116₁₀ / 164₈ / 74₁₆) (case sensitive)

]{2}the literal ] (93₁₀ / 135₈ / 5D₁₆) , repeated exactly 2 times

$end of string

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26 tokens

^(?:[[:xdigit:]]{2}([-:]))(?:[[:xdigit:]]{2}\1){4}[[:xdigit:]]{2}$

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