How do you Parse a query to convert numbers to strings

[Paul Taylor]

I think this is a common problem, but don't know the correct solution.
Users were doing queries on a numeric field such as qdur:[73 TO 117] and 
expecting to find all the values within but this fails because lucene 
treats the numbers as strings and just does alphabetical search. So I 
now index the field using
NumberTools.longToString()  so allows equivalent search  i.e. 
qdur:[00000000000021 TO 00000000000039] which works correctly.

Trouble user types query into a free text field and cannot expect user 
to do the conversion, so I need to convert qdur:[73 TO 117] to 
qdur:[00000000000021 TO 00000000000039] before doing the lucene search, 
Im trying to do this with regular expressions but not convinced its safe 
for all variations, is there a better way (Im using Lucene 2.9)?


Paul

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