Best way to read and process a text file with multiline records

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Data Value : (some number here)
Data Group : (Some string here)
Data RAW : (some text optionally followed by \ if the line gets too lo
+ng)

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Data_Value -3455
Data_Group Clock453
...
         .
         .
         -to endpoint/abc/CK

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Hash.Data_value=<sometthing>
hash.Data_Group=<something>
Hash.Data_line=<Line number of the data_raw field>

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Line no : <line number of data_raw field of insignificant data>
Data_processed_output -from blah blah
                      .         \
                      .          \
                      -to blah blah

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Data Group | Total Value Maximum Value | Minumum value

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