Regexp issue in NAPTR rewrite

[sandoche BALAKRICHENAN]

I want to rewrite a query of the form 
"sgtin.5.4.0.0.0.1.3.2.4.5.6.7.6.id.onsam.test" to 
"sgtin.5.4.0.0.0.1.3.2.4.5.6.7.6.id.onseu.test" using NAPTR rewrite.

The NAPTR RR in the zone config is as follows:

sgtin.5.4.0.0.0.1.3.2.4.5.6.7.6.id.onsam.test        IN     NAPTR    
0    0    "r"    ""      "!^sgtin\.([0-9])$!\1.id.onseu.test!"    .

BIND does not  accept backref "\1" . It shows a syntax error.

Is the above regexp correct?






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