New {language} and @regexp features.

1 files changed, 14 insertions, 5 deletions

diff --git a/etc/NEWS b/etc/NEWS
index 7d993150cd6..5736b243aff 100644
--- a/etc/NEWS
+++ b/etc/NEWS
@@ -570,11 +570,11 @@ comparison.
 ** Etags changes.
 
 *** New syntax for regular expressions, multi-line regular expressions.
-The syntax --ignore-case-regexp=/REGEX/NAME/ is now undocumented and
-retained only for backward compatibility.  The new equivalent syntax is
---regex=/REGEX/NAME/i.  More generally, it is --regex=/REGEX/NAME/MODS,
-where `/NAME' is optional, as usual, and MODS is a string of 0 or more
-characters among `i' (ignore case), `m' (multi-line) and `s'
+The syntax --ignore-case-regexp=/regex/ is now undocumented and retained
+only for backward compatibility.  The new equivalent syntax is
+--regex=/regex/i.  More generally, it is --regex=/TAGREGEX/TAGNAME/MODS,
+where `/TAGNAME' is optional, as usual, and MODS is a string of 0 or
+more characters among `i' (ignore case), `m' (multi-line) and `s'
 (single-line).  The `m' and `s' modifiers behave as in Perl regular
 expressions: `m' allows regexps to match more than one line, while `s'
 (which implies `m') means that `.' matches newlines.  The ability to
@@ -586,6 +586,15 @@ The escaped character sequence \a, \b, \d, \e, \f, \n, \r, \t, \v,
 respectively, stand for the ASCII characters BEL, BS, DEL, ESC, FF, NL,
 CR, TAB, VT,
 
+*** Regular expressions can be bound to a given language
+The syntax --regex={LANGUAGE}REGEX means that REGEX is used to make tags
+only for files of language LANGUAGE, and ignored otherwise.  This is
+particularly useful when storing regexps in a file.
+
+*** Regular expressions can be read from a file
+The --regex=@regexfile option means read the regexps from a file, one
+per line.  Lines beginning with space or tab are ignored.
+
 *** In Prolog, etags creates tags for rules in addition to predicates.
 
 *** In Perl, packages are tags.