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Regex-zerolength

Change-regex-zerolength

Modifying constructor for regex-zerolength structures.

Syntax

(change-regex-zerolength x 
                         [:pat <pat>] 
                         [:lookback <lookback>] 
                         [:negp <negp>])

This is an often useful alternative to make-regex-zerolength.

We construct a new regex-zerolength structure that is a copy of x, except that you can explicitly change some particular fields. Any fields you don't mention just keep their values from x.

Definition

This is an ordinary change- macro introduced by defprod.

Macro: change-regex-zerolength

(defmacro change-regex-zerolength (x &rest args)
  (std::change-aggregate 'regex-zerolength
                         x args
                         '((:pat . regex-zerolength->pat)
                           (:lookback . regex-zerolength->lookback)
                           (:negp . regex-zerolength->negp))
                         'change-regex-zerolength
                         'nil))