I would endorse Jenda's advice to avoid regexes for parsing (X|HT)ML.

However,
    $scalarWorkingConfig =~ s/.*(XXXXX[ |   ]*<$domainProperty .*$domainProperty>).*/$1/g;
suggests a misunderstanding of the syntax of character classes (i.e., the  [chars] construct; see perlre and Using character classes in perlretut and also perlrequick). The  '|' (pipe) character is not special (i.e., is not a metacharacter) in a character class, nor has the repetition of characters any significance. The character class  [ |   ] is the equivalent of  [ |] and consists of a blank-space character and a pipe character.

In reply to Re: How to make substitute greedy like sed's substitute by AnomalousMonk
in thread How to make substitute greedy like sed's substitute by PerlJedi

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