diff --git a/runtime/doc/pi_expl.txt b/runtime/doc/pi_expl.txt
deleted file mode 100644
index 62ee2c3..0000000
--- a/runtime/doc/pi_expl.txt
+++ /dev/null
@@ -1,215 +0,0 @@
-*pi_expl.txt*   For Vim version 7.0aa.  Last change: 2004 Dec 29
-
-
-		  VIM REFERENCE MANUAL    by M A Aziz Ahmed
-					  updated by Mark Waggoner
-
-
-						*file-explorer* *file-browser*
-Plugin for exploring (or browsing) directories and files
-
-1. Starting the file explorer		|expl-starting|
-
-The functionality mentioned here is a |standard-plugin|.
-This plugin is only available if 'compatible' is not set.
-You can avoid loading this plugin by setting the "loaded_explorer" variable: >
-	:let loaded_explorer = 1
-
-{Vi does not have any of this}
-
-==============================================================================
-1. Starting the file explorer				*expl-starting*
-
-This plugin is used to explore directories inside Vim. The file explorer is
-launched whenever the user tries to edit a directory.
-						*:Explore* *:Sexplore*
-To launch the explorer in the directory of the file currently edited: >
-	:Explore
-If the file has changes the window is split.  To always split the window: >
-	:Sexplore
-To launch the explorer in a specific directory: >
-	:Explore dirname
-	:Sexplore dirname
-
-From inside the explorer move your cursor to a line containing a file or
-directory name.  The following command keys are available:
-
-  <enter> will open the file in the window the explorer is currently
-      occupying.
-  'o' will split a new window and open the file in the new window.
-  'O' will open the file chosen using the window that the cursor was in just
-      before you started or entered the explorer window.  If the explorer is
-      the only window, it will first split a new window to use for the file to
-      be opened.
-  'p' will open (or use) the preview window showing the file
-  'x' will execute the file with the system tools.  Only when supported
-      (currently MS-Windows and KDE).
-
-When splitting off a new window, you can control where the split window will
-go relative to the explorer window using the variables g:explVertical,
-g:explSplitBelow and g:explSplitRight.
-
-							*g:explVertical*
-							*g:explSplitBelow*
-							*g:explSplitRight*
-							*g:explStartBelow*
-							*g:explStartRight*
-To control whether the split is made horizontally or vertically, use: >
-  let g:explVertical=1	" Split vertically
-  let g:explVertical=0	" Split horizontally (default)
-
-To control where the window goes relative to the explorer window when
-splitting horizontally, use the variable: >
-  let g:explSplitBelow=1    " Put new window below explorer window
-  let g:explSplitBelow=0    " Put new window above explorer window
-The default for this is the setting of splitbelow at the time the plugin is
-loaded.
-
-To control where the window goes relative to the explorer window when
-splitting vertically, use the variable: >
-  let g:explSplitRight=1    " Put new window to the right of the explorer
-  let g:explSplitRight=0    " Put new window to the left of the explorer
-The default for this is the setting of splitright at the time the plugin is
-loaded.
-
-To use a different split method for the explorer window, use: >
-  let g:explStartRight=1    " Put new explorer window to the right of the
-			    " current window
-  let g:explStartRight=0    " Put new explorer window to the left of the
-			    " current window
-The default is the value of g:explSplitRight at the time the plugin is loaded.
-
-To use a different split method for the explorer window, use: >
-  let g:explStartBelow=1    " Put new explorer window below the
-			    " current window
-  let g:explStartBelow=0    " Put new explorer window above the
-			    " current window
-The default is the value of g:explSplitBelow at the time the plugin is loaded.
-
-The start splits allow for the explorer window to be placed in a file browser
-type arrangement, where the directories are shown on the left and the contents
-opened on the right.  The start split settings are only used when issuing
-the Sexplore command.
-
-Note that the window split is done a little bit differently than window splits
-are usually done.  Ordinarily, when splitting a window, the space occupied by
-the current window will be split to give space for the new window.  The
-explorer attempts to instead split from a window adjacent to the explorer
-window so that the explorer window will not change sizes.  If there is not an
-adjacent window in the direction you are splitting, the explorer window is
-split.
-
-							*g:explWinSize*
-After opening a file with the 'o' command, you might want to resize the
-explorer window. This can be done by setting the variable >
-  let g:explWinSize=N
-N is the number of rows (when the window is split horizontally) or the number
-of columns (when the window is split vertically).  If g:explWinSize is set to
-an empty string (""), resizing will not be done.  g:explWinSize defaults to
-15.
-
-							*g:explDetailedList*
-The file size (in bytes) and modification time can be displayed inside the
-file explorer window. By pressing 'i', you can toggle between the name only
-display and the more lengthy display.  If you want the size and date to show
-by default, use >
-  let g:explDetailedList=1
-Doing this may slightly slow down explorer. The difference may or may not be
-noticeable depending on your system and whether the directory is local or on
-the network and on the size of the directory.
-
-							*g:explDateFormat*
-The format of date displayed is configurable using the variable
-g:explDateFormat.  explorer uses this variable to pass to strftime() to fetch
-the date information. |strftime()|  The default is >
-  let g:explDateFormat="%d %b %Y %H:%M"
-
-Note that for sorting purposes, the date is always placed at the end of the
-line in its 'raw' form.  If you have syntax highlighting turned on, this raw
-date should be invisible.
-
-							*g:explHideFiles*
-You can hide some files by filling the variable g:explHidFiles with regular
-expressions. A filename that matches any of these regular expressions will not
-be shown. For example, >
-
-  let g:explHideFiles='^\.,\.gz$,\.exe$,\.zip$'
-
-will not show files that begin with "." and those that end in .gz, .exe or
-.zip. However, all directory names will always be shown. If while exploring,
-you'd like to see the hidden files as well, use the command "a".
-The explorer header will indicate if filtering is being done.
-
-							*g:explDetailedHelp*
-The help information spanning a few lines can be turned off (and just a single
-help message enabled) using the option >
-  let g:explDetailedHelp=0
-You can anytime switch to the detailed help format by pressing ?.
-
-							*explorer-delete*
-Pressing 'D' inside explorer deletes the file under the cursor. You can delete
-many files by visually selecting them and using 'D'. The deletion is
-interactive in the form y/n/a/q. Directory deletion is not supported (mainly
-because there is no way to delete a directory using a vim built-in function).
-
-							*explorer-rename*
-Pressing 'R' inside explorer will allow you to rename the file under the
-cursor.
-
-							*g:explSortBy*
-The display in the file explorer can be sorted in forward or reverse order by
-name, size, or modification date.  You can set the default sorting direction
-with the option >
-  let g:explSortBy='name'		" alphabetically
-  let g:explSortBy='reverse name'	" reverse alphabetically
-  let g:explSortBy='date'		" newest first
-  let g:explSortBy='reverse date'	" oldest first
-  let g:explSortBy='size'		" largest first
-  let g:explSortBy='reverse size'       " smallest first
-While in the explorer, you can rotate through the sort fields by pressing the
-'s' key and you can reverse the current sort order by pressing the 'r' key.
-Sorting on fields other than the name will be faster if the size and date are
-displayed (using 'i' or g:explDetailedList).
-The explorer heading will indicate the current sort order.
-
-							*g:explDirsFirst*
-To control the segregation of directories and files, you can set this option >
-  let g:explDirsFirst=1     " Directories at the top of the list (default)
-  let g:explDirsFirst=0     " Directories mixed in with files
-  let g:explDirsFirst=-1    " Directories at the bottom of the list
-
-							*g:explSuffixesLast*
-To control the segregation of files matching the suffixes option, you can set
-this option >
-  let g:explSuffixesLast=1     " Files matching suffixes sorted at the bottom
-			       " of the list (default)
-  let g:explSuffixesLast=0     " Files matching suffixes sorted normally
-  let g:explSuffixesLast=-1    " Files matching suffixes sorted at the top of
-			       " the list
-The heading will indicate if suffixes have been moved to the end (or start) of
-the list.
-
-							*g:explUseSeparators*
-Directories and files matching the suffixes list will be highlighted.  If you
-have the directories, files, and suffixes separated, and you would like a
-separator line between the groups, you can set the option >
-  let g:explUseSeparators=1    " Use separator lines
-  let g:explUseSeparators=0    " Don't use separator lines
-<
-							 *g:explFileHandler*
-If you set the "g:explFileHandler" variable to the name of a function, typing
-'x' will call this function.  The file or directory under the cursor will be
-passed as an argument to the function.  Suppose you have KDE, you could use
-this: >
-
-  function MyFileHandler(fn)
-    exec "silent! !kfmclient exec " . escape(a:fn,' \%#')
-  endfunction
-  let g:explFileHandler = 'MyFileHandler'
-
-For Win32 the variable is set by default to invoke the execute action. If you
-type 'x' on a HTML file, Microsoft Internet Explorer will start (or whatever
-application you have associated with HTML files).
-
-==============================================================================
- vim:tw=78:noet:ts=8:ft=help:norl:
diff --git a/src/eval.c b/src/eval.c
index 1ef824b..3a7d245 100644
--- a/src/eval.c
+++ b/src/eval.c
@@ -116,6 +116,12 @@
 #define globvarht globvardict.dv_hashtab
 
 /*
+ * Old Vim variables such as "v:version" are also available without the "v:".
+ * Also in functions.  We need a special hashtable for them.
+ */
+hashtab_T		compat_hashtab;
+
+/*
  * Array to hold the hashtab with variables local to each sourced script.
  * Each item holds a variable (nameless) that points to the dict_T.
  */
@@ -213,7 +219,7 @@
 typedef struct
 {
     dict_T	*fd_dict;	/* Dictionary used */
-    char_u	*fd_newkey;	/* new key in "dict" */
+    char_u	*fd_newkey;	/* new key in "dict" in allocated memory */
     dictitem_T	*fd_di;		/* Dictionary item used */
 } funcdict_T;
 
@@ -599,6 +605,7 @@
 
     init_var_dict(&globvardict, &globvars_var);
     init_var_dict(&vimvardict, &vimvars_var);
+    hash_init(&compat_hashtab);
 
     for (i = 0; i < VV_LEN; ++i)
     {
@@ -613,8 +620,8 @@
 	/* add to v: scope dict */
 	hash_add(&vimvarht, p->vv_di.di_key);
 	if (p->vv_flags & VV_COMPAT)
-	    /* add to g: scope dict */
-	    hash_add(&globvardict.dv_hashtab, p->vv_di.di_key);
+	    /* add to compat scope dict */
+	    hash_add(&compat_hashtab, p->vv_di.di_key);
     }
 }
 
@@ -2548,7 +2555,9 @@
     len = STRLEN(tofree);
     name = deref_func_name(tofree, &len);
 
-    startarg = arg;
+    /* Skip white space to allow ":call func ()".  Not good, but required for
+     * backward compatibility. */
+    startarg = skipwhite(arg);
     rettv.v_type = VAR_UNKNOWN;	/* clear_tv() uses this */
 
     if (*startarg != '(')
@@ -2815,12 +2824,12 @@
     expand_T	*xp;
     int		idx;
 {
-    static int	gdone;
-    static int	bdone;
-    static int	wdone;
-    static int	vidx;
-    static hashitem_T *hi;
-    hashtab_T	*ht;
+    static long_u	gdone;
+    static long_u	bdone;
+    static long_u	wdone;
+    static int		vidx;
+    static hashitem_T	*hi;
+    hashtab_T		*ht;
 
     if (idx == 0)
 	gdone = bdone = wdone = vidx = 0;
@@ -2830,6 +2839,8 @@
     {
 	if (gdone++ == 0)
 	    hi = globvarht.ht_array;
+	else
+	    ++hi;
 	while (HASHITEM_EMPTY(hi))
 	    ++hi;
 	if (STRNCMP("g:", xp->xp_pattern, 2) == 0)
@@ -2843,6 +2854,8 @@
     {
 	if (bdone++ == 0)
 	    hi = ht->ht_array;
+	else
+	    ++hi;
 	while (HASHITEM_EMPTY(hi))
 	    ++hi;
 	return cat_prefix_varname('b', hi->hi_key);
@@ -2859,6 +2872,8 @@
     {
 	if (bdone++ == 0)
 	    hi = ht->ht_array;
+	else
+	    ++hi;
 	while (HASHITEM_EMPTY(hi))
 	    ++hi;
 	return cat_prefix_varname('w', hi->hi_key);
@@ -5717,7 +5732,7 @@
     {"string",		1, 1, f_string},
     {"strlen",		1, 1, f_strlen},
     {"strpart",		2, 3, f_strpart},
-    {"strridx",		2, 2, f_strridx},
+    {"strridx",		2, 3, f_strridx},
     {"strtrans",	1, 1, f_strtrans},
     {"submatch",	1, 1, f_submatch},
     {"substitute",	4, 4, f_substitute},
@@ -11791,9 +11806,10 @@
     if (argvars[2].v_type != VAR_UNKNOWN)
     {
 	start_idx = get_tv_number(&argvars[2]);
-	if (start_idx < 0 || start_idx >= (int)STRLEN(haystack))
+	if (start_idx >= (int)STRLEN(haystack))
 	    return;
-	haystack += start_idx;
+	if (start_idx >= 0)
+	    haystack += start_idx;
     }
 
     pos	= (char_u *)strstr((char *)haystack, (char *)needle);
@@ -11885,20 +11901,38 @@
     char_u	*haystack;
     char_u	*rest;
     char_u	*lastmatch = NULL;
+    int		haystack_len, end_idx;
 
     needle = get_tv_string(&argvars[1]);
     haystack = get_tv_string_buf(&argvars[0], buf);
+    haystack_len = STRLEN(haystack);
     if (*needle == NUL)
 	/* Empty string matches past the end. */
-	lastmatch = haystack + STRLEN(haystack);
+	lastmatch = haystack + haystack_len;
     else
+    {
+	if (argvars[2].v_type != VAR_UNKNOWN)
+	{
+	    /* Third argument: upper limit for index */
+	    end_idx = get_tv_number(&argvars[2]);
+	    if (end_idx < 0)
+	    {
+		/* can never find a match */
+		rettv->vval.v_number = -1;
+		return;
+	    }
+	}
+	else
+	    end_idx = haystack_len;
+
 	for (rest = haystack; *rest != '\0'; ++rest)
 	{
 	    rest = (char_u *)strstr((char *)rest, (char *)needle);
-	    if (rest == NULL)
+	    if (rest == NULL || rest > haystack + end_idx)
 		break;
 	    lastmatch = rest;
 	}
+    }
 
     if (lastmatch == NULL)
 	rettv->vval.v_number = -1;
@@ -13408,6 +13442,11 @@
 	if (vim_strchr(name, ':') != NULL)
 	    return NULL;
 	*varname = name;
+
+	/* "version" is "v:version" in all scopes */
+	if (!HASHITEM_EMPTY(hash_find(&compat_hashtab, name)))
+	    return &compat_hashtab;
+
 	if (current_funccal == NULL)
 	    return &globvarht;			/* global variable */
 	return &current_funccal->l_vars.dv_hashtab; /* l: variable */