Regular Expressions 101

Group 1(Ulist\d+)

Ulistthe literal text Ulist (case sensitive)

\d+a digit, repeated at least once

Group 2(\[\[(?>[^][]|(?2))*]])

\[the literal [ (91₁₀ / 133₈ / 5B₁₆)

Atomic Group(?>[^][]|(?2))*

*repeats the group contents below any number of times:

1st Alternative[^][]

Negated Character Class[^][]

]the literal ] (93₁₀ / 135₈ / 5D₁₆)

[the literal [ (91₁₀ / 133₈ / 5B₁₆)

2nd Alternative(?2)

(?2)calls group 2 as a subroutine

]]the literal text ]]

Global pattern flags

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

Detailed match information will be displayed here automatically.

Search reference

Regular Expression

(Ulist\d+)(\[\[(?>[^][]|(?2))*]])

New

| item1 | item2 | item3 | Ulist1[[ | item4 | item5 | Ulist2[[ | item6 | item7 ]] | item8 ]] | item9 | list3[[ | item10 | item11 | item12 ]] | item13 | item14

Regular Expression

Extraction