Parsing tnsnames.ora using regex...
- by Welton v3.50
I am attempting to pull some information from my tnsnames file using regex. I started with the following pattern:
MYSCHEMA *? = *?[\W\w\S\s]*\(HOST *?= *?(?<host>\w+\s?)\)\s?\(PORT *?= *?(?<port>\d+)\s?\)[\W\w\S\s]*\(SERVICE_NAME *?= *?(?<servicename>\w+)\s?\)
which worked fine when MYSCHEMA was the only schema in the file, but when there are other schemas listed after MYSCHEMA it matches all the way to the last schema.
I have since created a new pattern:
MYSCHEMA *=\s*\(DESCRIPTION =\s*\(ADDRESS *= *\(PROTOCOL *= *TCP\)\(HOST *= *(?<host>\w+)\)\(PORT *= *(?<port>\d+)\)\)\s*\(CONNECT_DATA *=\s*(?<serverdedicated>\(SERVER *= *DEDICATED\))\s*\(SERVICE_NAME *= *(?<servicename>[\w\.]+) *\)\s*\)\s*\)
This pattern matches MYSCHEMA only, but I had to add every element that appeared in MYSCHEMA entry, and it won't match MYOTHERSCHEMA if it does not contain all the same elements.
Ideally, I'd like a pattern that matches MYSCHEMA entry only, and captures HOST, PORT and SERVICE NAME, and optionally (SERVER = DEDICATED) (which I didn't have in the first pattern) to named groups.
Below is the sample tnsnames that I've been using for testing:
SOMESCHEMA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = REMOTEHOST)(PORT = 1234))
)
(CONNECT_DATA = (SERVICE_NAME = REMOTE)
)
)
MYSCHEMA =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = MYHOST)(PORT = 1234))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = MYSERVICE.LOCAL )
)
)
MYOTHERSCHEMA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = MYHOST)(PORT = 1234))
)
(CONNECT_DATA =
(SERVICE_NAME = MYSERVICE.REMOTE)
)
)
SOMEOTHERSCHEMA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = LOCALHOST)(PORT = 1234))
)
(CONNECT_DATA =
(SERVICE_NAME = LOCAL)
)
)
