XSD/XML RegEx Pattern Value

Question

I have been provided with an XSD I am validating XML against. The XML is failing validation because the XSD is incorrect. I have one field that is meant to allow a 1 - 3 character string. The first character has got to be A, B, C or Z and may optionally be followed by upto 2 characters. I have not had much to do with regular expessions but have tried all manner of combinations to no avail.

The expression supplied is <xs:pattern value="([A,B,C,Z]{1}\w\?{2})"/>

Valid Examples of data are:

B B6 BB AB

Invalid:

G3 A B 6HC

Im sure its a fairly simple expression but I dont seen to be able to get it right!

John Kugelman · Accepted Answer · 2013-11-27 13:40:28Z

2

[ABCZ]\w{0,2}

No commas in []. {0,2} allows for 0 to 2 word characters. Got rid of the \?, that would match a literal question mark.

answered Nov 27, 2013 at 13:40

John Kugelman

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2 Comments

Fred Over a year ago

Thanks John, I did have this and it is nearly there but it passes A 4 as valid. The space between A and 4 needs to make it invalid.

Fred Over a year ago

Sorry John, I have been checking the expressions on an online RegEx checker seems Im either reading the results wrong or the checker is passing invalid data. I updated the XSD and rechecked the XML. Worked perfectly. Thanks.

DINESH BUSWALA · Accepted Answer · 2019-02-15 09:29:37Z

0

It is a kind of the regular expression. Each symbol have its meaning, I think all are trivial to understand except "?", which means the set of character that succeeds with ? have zero or one occurrence (Don't confuse with the * it means zero or many occurrence). http://www.xmlschemareference.com/regularExpression.html

answered Feb 15, 2019 at 9:29

DINESH BUSWALA

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