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Jas JohlJas Johl 

Can anyone provide me with instructions to identify Record ID's stored as strings

For data archival. 
SandhyaSandhya (Salesforce Developers) 
Hi,

Normally the Id Field Type is a base-62 encoded string.
Each character can be one of 62 possible values:
a lowercase letter (a-z) - 26 values
an uppercase letter (A-Z) - 26 values
a numeric digit (0-9) - 10 values

Please refer below link for more information.

http://salesforce.stackexchange.com/questions/1653/what-are-salesforce-ids-composed-of
 
Thanks and Regards
Sandhya