graph definition: file pattern

For those who are interested, I hacked myself a patch.  This allows you to add a CGI parameter cgipat with a regular expression.
For instance, if you want to match all filesystems beginning with /home, add this to the url:
cgipat=/home.*

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< char *cgipat = NULL;
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<               else if (strcmp(cwalk->name, "cgipat") == 0) {
<                       cgipat = strdup(cwalk->value);
<               }
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<       if (cgipat) {
<               addtobuffer(result, "&amp;cgipat="); <               addtobuffer(result, urlencode(cgipat));
<       }
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<               pcre *pat, *expat = NULL, *cgipatt = NULL ;
---

              pcre *pat, *expat = NULL;

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<               if (cgipat) {
<                       cgipatt = pcre_compile(cgipat, PCRE_CASELESS, &errmsg, &errofs, NULL);
<                       if (!cgipatt) {
<                               char msg[8192];
< <                               snprintf(msg, sizeof(msg), <                                        "CGIpat error, PCRE pattern %s invalid: %s, offset %d\n",
<                                        htmlquoted(cgipat), errmsg, errofs);
<                               errormsg(msg);
<                       }
<               }
< 989,994d968
< <          if (cgipatt) {
<                          result = pcre_exec(cgipatt, NULL, d->d_name, strlen(d->d_name), 0, 0, <                                             ovector, (sizeof(ovector)/sizeof(int)));
<                          if (result < 0) continue;
<          }