Example of confilcting Regular Expressions with aliases:

alias regextest {
  noop $regex(Here is my regex,/(.+)/)
  echo -a $!regml(1): $regml(1)
  var %a = $regedit($regml(1))
  var %b = $regml(1)
  echo -a % $+ a - %a
  echo -a % $+ b - %b
}
alias regedit return $regsubex(abc,/D/,lol)

that kills the original $regml(1), and replaces it with nothing, as there is no $regml to be captured in that alias.

However; adding a regex name to the identifier solves this problem.

alias regextest2 {
  noop $regex(Here is my regex,/(.+)/)
  echo -a $!regml(1): $regml(1)
  var %a = $regedit2($regml(1))
  var %b = $regml(1)
  echo -a % $+ a - %a
  echo -a % $+ b - %b
}
alias regedit2 return $regsubex($ticks,abc,/D/,lol)