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Asked: 2026-05-15T15:17:21+00:00

I am using a tool to generate test data for our database. For columns

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I am using a tool to generate test data for our database. For columns that are string fields, we have the option of entering a regular expression that will be used to generate values for the column. I would like a regular expression that generates a 15 character string as follows:

  1. Characters 1-6 should consist of the YYMMDD (current year,month,day) such as “100702”. If it’s not possible for RegEx to determine the current date, a hard-wired value of “100702” would be fine.
  2. Characters 7-8 should be either ’25’ or ’26’
  3. Characters 9-15 should a sequential series of digits starting with ‘0000001’, then ‘0000002’ etc. If this cannot be done, a random, but unique, set of 7 digits would work.

Is this possible?

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1 Answer

  1. Editorial Team

    No, regex does not generate text, it matches text.

    However, if you’re using Java, take a look at Xeger which can do what you want.

    Also, see these similar questions:
    Using Regex to generate Strings rather than match them
    How do I generate text matching a regular expression from a regular expression?
    Reverse regular expressions to generate data

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