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-rw-r--r--doc/rainerscript.html5
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diff --git a/doc/rainerscript.html b/doc/rainerscript.html
index fcc2674d..df31db2a 100644
--- a/doc/rainerscript.html
+++ b/doc/rainerscript.html
@@ -61,6 +61,11 @@ variable, if it exists. Returns an empty string if it does not exist.
<li>cstr(expr) - converts expr to a string value
<li>cnum(expr) - converts expr to a number (integer)
<li>re_match(expr, re) - returns 1, if expr matches re, 0 otherwise
+<li>field(str, delim, matchnbr) - returns a field-based substring. str is the string
+to search, delim is the numerical ascii value of the field delimiter (so that
+non-printable characters can by specified) and matchnbr is the match to search
+for (the first match starts at 1). This works similar as the field based
+property-replacer option.
</ul>
<p>The following example can be used to build a dynamic filter based on some environment
variable: