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+# rlm_expr
+## Metadata
+<dl>
+ <dt>category</dt><dd>policy</dd>
+</dl>
+
+## Summary
+
+Support for mathematical calculations via the 'expr' XLAT. Also
+adds many other useful XLATs that are not available in the server
+core, such as random numbers, tolower/toupper, escaping, MD5/SHA and
+base64 encoding.