Regular Expressions 101

1st Alternative(?<=A){n}(?=(?:{n})*A)

Positive Lookbehind(?<=A)

Athe literal A (65₁₀ / 101₈ / 41₁₆) (case sensitive)

{n}the literal text {n} (case sensitive)

Positive Lookahead(?=(?:{n})*A)

Non-Capturing Group(?:{n})*

*repeats the group contents below any number of times:

{n}the literal text {n} (case sensitive)

Athe literal A (65₁₀ / 101₈ / 41₁₆) (case sensitive)

2nd Alternative\G(?!^){n}

\Gstart of current search

Negative Lookahead(?!^)

^start of string

{n}the literal text {n} (case sensitive)

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

(?<=A){n}(?=(?:{n})*A)|\G(?!^){n}

New

{n}{n}A{n}{n}A{n}
{n}A{n}{n}{n}{n}A
{n}{n}A{n}A{n}{n}
{n}{n}{n}A{n}A{n}B
{n}A{n}{n}B{n}{n}
A{n}B{n}{n}{n}{n}