Save substring from field to copyfield using regex in Solr - regex

Question

I'm importing data from mysql table using import handler. I have a column msg, of type text. Using regex, I have to save substring in a copy field.
msg: 94eb2c0cb17ef354bb052c57f40c\r\nContent-Type: text/plain; charset=UTF-8\r\nContent-Transfer-Encoding pnr:986|0978325
Expected Solr result:
{
"msg_body": "94eb2c0cb17ef354bb052c57f40c\\r\\nContent-Type: text/plain; charset=UTF-8\\r\\nContent-Transfer-Encoding pnr:986-0978325",
"pnr_number": "pnr:986-0978325"
}
My REGEX:
(pnr|(P|p)[ _.:,!"'-/$](N|n)[ _.:,!"'-/$](R|r))+[ _.:,!"'-/$]+[0-9]{3}[ _.:,!"'-/$]+[0-9]{7}
Please help me out as i'm new to solr

Answer 1

You'll need to define a custom field for pnr_number.
Use a copyField to copy msg_body to pnr_number
In the custom field definition, use
<filter class="solr.PatternCaptureGroupFilterFactory" pattern="regex goes here" preserve_original="false"/>

Answer 2

Since you are using Data Import Handler, you have 3 options:
Use a Regex Transformer in DIH definition.
Use a RegexReplaceProcessorFactory Update Request Processor (in solrconfig.xml).
Use a Regex filter in the analyzer chain
With the first two options, the regex will extract the pattern before the field is actually indexed. In the last option, the stored representation (if you store the field) will contain the original full string, but the indexed (searchable) representation will contain regex match.