maki:
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An attempt to repeat something that can not be repeated in the regular
expression
Include char:
.
!
?

(\.|!|?)
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You need to escape the regex metacharacters, if they should be matched
litterally
most likely, you need
\?
 instead of ?
in the above pattern.
note, that alternation of single characters is the same as character set, i.e.
[.!?]

hth,
  vbr

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