[elpa] externals/xr e8ec2d9 07/13: Add reference to the pcre2el package

[Mattias Engdegård]

branch: externals/xr
commit e8ec2d9d7a0e65aeb888da353b9d079285787c07
Author: Mattias Engdegård <address@hidden>
Commit: Mattias Engdegård <address@hidden>

    Add reference to the pcre2el package
---
 xr.el | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/xr.el b/xr.el
index 761cac7..5a32a52 100644
--- a/xr.el
+++ b/xr.el
@@ -50,9 +50,17 @@
 ;; maximum readability, consistency and personal preference when
 ;; replacing existing regexps in elisp code.
 
-;; Similar functionality is provided by the `lex' package in the form of the
-;; `lex-parse-re' function, but `xr' does not depend on `lex' and does
-;; a more thorough job of handling all corner cases of Elisp's regexp syntax.
+;; Related work:
+;;
+;; The `lex' package, a lexical analyser generator, provides the
+;; `lex-parse-re' function which performs a similar task, but does not
+;; attempt to handle all the edge cases of Elisp's regexp syntax or
+;; pretty-print the result.
+;;
+;; The `pcre2el' package, a regexp syntax converter and interactive regexp
+;; explainer, could also be used for the same tasks. `xr' is narrower in
+;; scope but more accurate for the purpose of parsing Emacs regexps and
+;; printing the results in rx form.
 
 ;;; Code: