XML Regex - Negative match

问题

I have a problem with negative lookahead in XSD pattern. When I specified:

<xs:pattern value="^(?!(00|\+\d))\d{6,}$"/>

then I got an error message:

Value '^(?!(00|\+\d))\d{6,}$' is not a valid XML regular expression.

Any idea why it does not work?

In online javascript validator it works fine (e.g. here under unit tests section click on "run test").

I need to validate phone numbers. The phone number cannot include international prefixes (+\d) and (00).

Thanks

回答1:

Try the following regex:

[1-9][0-9]{5,} | 0[1-9][0-9]{4,}

This matches a number which does not begin with zero and is followed by any digit (including zero) 5 or more times, and it also matches a number which starts with zero and is not immediately followed by zero, but after that can have 0-9.

回答2:

I will add my deleted comment as an answer:

([1-9][0-9]|[0-9][1-9])[0-9]{4,}

See the regex demo.

The regex should work well for your scenario because

• ([1-9][0-9]|[0-9][1-9]) - matches either 1 digit from 1-9 ranges and any digit after or (|) any 1 digit followed with any digit but 0 - making up 2 digits
• [0-9]{4,} - matches 4 and more any digits.

This pattern only matches a full/entire string because all regex patterns inside XSD pattern are anchored by default (so, you do not have to and can't enclose the pattern with ^ and $).

Right, there is no lookaround support in XSD regex (no lookaheads, nor lookbehinds). Besides, XSD regex has other interesting limitations/features:

• ^ and $ anchors
• Non-capturing groups like (?:...) (use capturing ones instead)
• / should not be escaped, do not use \/
• \d should be written as [0-9] to only match ASCII digits (same as in .NET)
• Back-references like \1, \2 are not supported.
• No word boundaries are supported either.

See some more XSD regex description at regular-expressions.info.

来源：https://stackoverflow.com/questions/38436165/xml-regex-negative-match