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Pattern guards allow you to say that a particular pair should only be
replaced when the input matches a particular regular expression.
It is tied to the 'G' or 'Guard' control on the pair header, and is one
of the 3 or so major features I want to implement before a 1.0 release
As an aside, the other two features I want to add are:
Multibody Support
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This will allow a pair to replace to a few different things, based on
various conditions (the two main ones I want are some sort of cyclic
behavior, and some sort of guards for these)
Sub-application
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Allow the application of a stage to the result of applying a pair/parts
of applying a pair. This will likely entail several sub-features such
as:
Named Stages
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A named stage is a collection of pairs that isn't applied by default,
but is instead used for convenient grouping of related pages together.
Custom Replacement
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Instead of using replaceAll, I'll probably go for something using
appendReplacement etc. on Matcher and roll some sort of custom thing, so
as to provide for a convenient syntax for anything special I want to do
while running the replacement.
I'll also want to add some documentation, in addition to maybe doing
some restructuring to make how things are laid out more obvious.
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