Index: elogd.c
===================================================================
--- elogd.c	(revision 2414)
+++ elogd.c	(working copy)
@@ -74,6 +74,8 @@
 char attr_list[MAX_N_ATTR][NAME_LENGTH];
 char attr_options[MAX_N_ATTR][MAX_N_LIST][NAME_LENGTH];
 int attr_flags[MAX_N_ATTR];
+/** Validation pattern for attribute, to test if it contains expected value */
+char attr_valid_pattern[MAX_N_ATTR][NAME_LENGTH];
 
 char attr_list_default[][NAME_LENGTH] = { "Author", "Type", "Category", "Subject", "" };
 
@@ -7033,7 +7035,7 @@
 
 int scan_attributes(char *logbook)
 /* scan configuration file for attributes and fill attr_list, attr_options
- and attr_flags arrays */
+ and attr_flags and attr_valid_pattern arrays */
 {
    char list[10000], str[NAME_LENGTH], str2[NAME_LENGTH], type[NAME_LENGTH],
        tmp_list[MAX_N_ATTR][NAME_LENGTH];
@@ -7062,11 +7064,20 @@
          }
       }
 
-      /* get options lists for attributes */
+      /* get options lists and validation patterns for attributes */
       memset(attr_options, 0, sizeof(attr_options));
+      memset(attr_valid_pattern, 0, sizeof(attr_valid_pattern));
       for (i = 0; i < n; i++) {
          n_options = 0;
 
+         sprintf(str, "ValidPattern %s", attr_list[i]);
+         if (getcfg(logbook, str, list, sizeof(list)))
+         {
+            strncpy(attr_valid_pattern[i], list, sizeof(attr_valid_pattern[i])-1);
+            attr_valid_pattern[i][sizeof(attr_valid_pattern[i])-1] = 0;
+            attr_flags[i] |= AF_HAS_VALID_PATT;
+         }
+
          sprintf(str, "Options %s", attr_list[i]);
          if (getcfg(logbook, str, list, sizeof(list)))
             n_options = strbreak(list, attr_options[i], MAX_N_LIST, ",", FALSE);
@@ -9650,6 +9661,17 @@
             rsprintf("    document.form1.%s.focus();\n", ua);
             rsprintf("    return false;\n");
             rsprintf("  }\n");
+            if (attr_flags[i] & AF_HAS_VALID_PATT) 
+            {
+              sprintf(str, loc("var validPatt=new RegExp(\"%s\");"), attr_valid_pattern[i]);
+              rsprintf("  %s\n", str);
+              rsprintf("  if (!validPatt.test(document.form1.%s.value)) {\n", ua);
+              sprintf(str, loc("Invalid value for attribute '%s'"), attr_list[i]);
+              rsprintf("    alert(\"%s\");\n", str);
+              rsprintf("    document.form1.%s.focus();\n", ua);
+              rsprintf("    return false;\n");
+              rsprintf("  }\n");
+            }
          }
       }
 
Index: elogd.h
===================================================================
--- elogd.h	(revision 2414)
+++ elogd.h	(working copy)
@@ -192,6 +192,7 @@
 #define AF_MUSERLIST         (1<<13)
 #define AF_USEREMAIL         (1<<14)
 #define AF_MUSEREMAIL        (1<<15)
+#define AF_HAS_VALID_PATT    (1<<16)
 
 /* attribute format flags */
 #define AFF_SAME_LINE              1