Regular Expressions 101

Community Patterns

Community Library Entry

0

Regular Expression
PCRE2 (PHP >=7.3)

/
(?(?=a)(a(ba)*b?|(ab)*)|(b(ab)*a?|(ba)*))
/

Description

Gramática: S->E S->aA S->bB A->E A->bB B->E B->aA

Submitted by anonymous - 2 years ago