Support FF's sticky regex flag.

Author: int3

syntax/javascript.vim

@@ -75,7 +75,7 @@ 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  javaScriptRegexpString   start=+\(\(\(return\|case\)\s\+\)\@<=\|\(\([)\]"']\|\d\|\w\)\s*\)\@<!\)/\(\*\|/\)\@!+ skip=+\\\\\|\\/+ end=+/[gim]\{,3}+ contains=javaScriptSpecial,javaScriptRegexpCharClass,@htmlPreproc oneline
+syntax region  javaScriptRegexpString   start=+\(\(\(return\|case\)\s\+\)\@<=\|\(\([)\]"']\|\d\|\w\)\s*\)\@<!\)/\(\*\|/\)\@!+ skip=+\\\\\|\\/+ end=+/[gimy]\{,4}+ contains=javaScriptSpecial,javaScriptRegexpCharClass,@htmlPreproc oneline
 syntax match   javaScriptNumber         /\<-\=\d\+L\=\>\|\<0[xX]\x\+\>/
 syntax match   javaScriptFloat          /\<-\=\%(\d\+\.\d\+\|\d\+\.\|\.\d\+\)\%([eE][+-]\=\d\+\)\=\>/
 syntax match   javaScriptLabel          /\<\w\+\(\s*:\)\@=/