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  1. or download this
    m{
  A         # A
...
  [^AB]*    # 0 or more non-A and non-B characters
  A         # an A
}x
  2. or download this
    BEFORE & AFTER       REGEX
<>  <A01234567890A>  A
...
<A01234567890A>  <>  B       FAILED
<A0123456789>  <0A>  .
<A01234567890>  <A>  B       FAILED
  3. or download this
    <A012345678>  <90A>  .
<A0123456789>  <0A>  B       FAILED
  4. or download this
    <A01234567890>  <A>  [^AB]*
<A01234567890>  <A>  A
<A01234567890A>  <>          FINISHED