Regular Expressions 101

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

Character Class[\?&]

\?the literal ? (63₁₀ / 77₈ / 3F₁₆)

&the literal & (38₁₀ / 46₈ / 26₁₆)

si=the literal text si= (case insensitive)

Group 1(\d+)

\d+a digit, repeated at least once

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

.*[\?&]si=(\d+)

New

http://www.example.me/area/?bb=4894&si=4077765&f=fjjjf