https://lists.midnight-commander.org/pipermail/mc-devel/2007-April/007517.html
[bug #19333] Search and replace misbehavior with regexps and "%" in replacement
search and replacebugmisbehaviorregexpsreplacement
https://www.compilers.iecc.com/comparch/article/19-12-021
Comp.compilers: How make multifinished DFA for merged regexps?
From comp.compilers newsgroup: How make multifinished DFA for merged regexps?
compmakedfamergedregexps