Fix regex character class matching.

int3 · int3 · commit c0753fe82f79 · 2012-02-10T22:32:41.000-05:00
In Javascript, /[]/ denotes an empty character class (matches nothing),
and /[^]/ denotes the negation of an empty character class (matches
everything). This differs from languages like Python, which do not allow
empty character classes.
diff --git a/syntax/javascript.vim b/syntax/javascript.vim
@@ -74,7 +74,7 @@ syntax case match
 syntax match   javaScriptSpecial        "\\\d\d\d\|\\x\x\{2\}\|\\u\x\{4\}\|\\."
 syntax region  javaScriptStringD        start=+"+  skip=+\\\\\|\\$"+  end=+"+  contains=javaScriptSpecial,@htmlPreproc
 syntax region  javaScriptStringS        start=+'+  skip=+\\\\\|\\$'+  end=+'+  contains=javaScriptSpecial,@htmlPreproc
-syntax region  javaScriptRegexpCharClass start=+\[\]\|\[^\]\|\[+ end=+\]+ contained
+syntax region  javaScriptRegexpCharClass start=+\[+ end=+\]+ contained
 syntax region  javaScriptRegexpString   start=+\(\(\(return\|case\)\s\+\)\@<=\|\(\([)\]"']\|\d\|\w\)\s*\)\@<!\)/\(\*\|/\)\@!+ skip=+\\\\\|\\/+ end=+/[gim]\{,3}+ contains=javaScriptSpecial,javaScriptRegexpCharClass,@htmlPreproc oneline
 syntax match   javaScriptNumber         /\<-\=\d\+L\=\>\|\<0[xX]\x\+\>/
 syntax match   javaScriptFloat          /\<-\=\%(\d\+\.\d\+\|\d\+\.\|\.\d\+\)\%([eE][+-]\=\d\+\)\=\>/
