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Regular Expressions

 
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Questionregular expression to find tax file numbers Pin
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Member 13555386 wrote:
TFN includes a check digit for detecting erroneous numbers. ... Can it be done?


No.

Although if I was using Perl one can create a "regex" that call a method as part of the regular expression check itself.

But I still wouldn't suggest doing that.

There is no real standard for "regular expressions" so first you would need to define exactly what regular expression engine you are using.

If you are using perl or java then there is a boundary match which might or might not be appropriate for your actual content.


Member 13555386 wrote:
(\d{8,9})|(\d\d\d[ ]\d\d\d[ ]\d\d\d)|(\d\d\d[-]\d\d\d[-]\d\d\d)


Following provides a single range of 8-9 digits and then a range of nine digits with spaces or dashes.

(\d{8,9})|(\d\d\d[- ]\d\d\d[- ]\d\d\d)


You could make one of those digits optional by adding a '?' after it. I do not know which one that should be.

Other suggestions really require knowing what regex engine you are using (rather than going through every possibility.)
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QuestionCorrect Expression For 'Any Character Including Whitespace' Pin
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QuestionHow to retain characters preceding a match? Pin
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