QuoteMeta Behavior ( the \Q .. \E construct )
Quotemeta is unusual in that it is a host language pre-processor dependency.
Specifically this has to do with Perl.
However, this construct can be presented to Regular Expression engines.
That is a problem for host languages that are not Perl, like PCRE for instance.
PCRE will recognize the \Q .. \E construct, but it does not really want to
do pre-processing on it.
To accommodate this behavior, RegexFormat offers the option
to recognize this construct and even resolve its content into its escaped
literal character form.
This option is be automatically enabled/disabled from the Flags Pane based
on the preset Language selected and what that Language has the ability to do.
As always, all options are customizable.
Allow Quotemetta Processing
This is the flag that turns \Q .. \E processing on or off.
When turned on, two other flags become available.
1. Recognize quotemeta construct in classes
This option will do \Q .. \E parsing in the class but it will not escape/resolve
its content. Internally, the option to escape quotemeta content in classes
is available, but it was decided not to make it selectable because of some
2. Escape quotemeta content
This option will resolve any level of \Q .. \E nesting to its literal form only
if the construct is OUTSIDE of a class.
In general, caution should be used when enabling this construct.
The \Q will start a recursive nesting algorithm looking for its mating \E.
If not found, every character to the end of file will be considered
quotemeta and not regular expression. This could lead to unexpected
errors popping up.
Finally, PCRE and Perl are the only flavors for which quotemeta processing
are available, but again (as always), all options are customizable.
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