[SR-Users] dialplan regex confusion

[thrillerbee]

I'm using the following in dialplan:

id | dpid | pr | match_op |               match_exp                |
match_len |                  subst_exp                   | repl_exp |
       attrs
----+------+----+----------+----------------------------------------+-----------+----------------------------------------------+----------+----------------------------------
 3 |    3 |  0 |        1 | ^30\d{3}#\+?1?[2-9]\d{2}[2-9]\d{6}$    |
0 | ^(30\d{3}#)(\+?1?)([2-9]\d{2}[2-9]\d{6}$)    | \11\3    | normalize
prefixed domestic

A R-URI goes in as 30001#12345678910
It comes out as 30001#*\1*12345678910

Can someone help me understand why? I'd expect to be exactly what it was
originally but for some reason '\1' is thrown in the middle...

Thanks,
Ryan
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