[SR-Users] htable shtcn expressions

[Brooks Bridges]

Referring to the expressions outlined at http://www.kamailio.org/wiki/cookbooks/5.4.x/pseudovariables#shtcn_htable_exp , is there any additional documentation or examples floating around that further explains how the right and left prefix matching works?  The rest of them are pretty clear, but I'm having troubles with these and can't get them working like I would expect them to work.
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