Regular Expressions 101

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Regular Expression
Created·2023-02-02 21:23
Flavor·PCRE2 (PHP)

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

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

Submitted by anonymous