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POHow to check if string is a valid XML element name?
 

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  1. POHow to check if string is a valid XML element name?
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    <p>I need a regex or a function in PHP that will validate a string to be a good XML element name.</p> <p>Form w3schools:</p> <blockquote> <p>XML elements must follow these naming rules:</p> <ol> <li>Names can contain letters, numbers, and other characters</li> <li>Names cannot start with a number or punctuation character</li> <li>Names cannot start with the letters xml (or XML, or Xml, etc)</li> <li>Names cannot contain spaces</li> </ol> </blockquote> <p>I can write a basic regex that will check for rules 1,2 and 4, but it won't account for all punctuation allowed and won't account for 3rd rule</p> <pre><code>\w[\w0-9-] </code></pre> <h3>Friendly Update</h3> <p>Here is the more authoritative source for <a href="http://www.w3.org/TR/REC-xml/#NT-NameChar" rel="noreferrer">well-formed XML Element names</a>:</p> <p>Names and Tokens</p> <pre><code>NameStartChar ::= ":" | [A-Z] | "_" | [a-z] | [#xC0-#xD6] | [#xD8-#xF6] | [#xF8-#x2FF] | [#x370-#x37D] | [#x37F-#x1FFF] | [#x200C-#x200D] | [#x2070-#x218F] | [#x2C00-#x2FEF] | [#x3001-#xD7FF] | [#xF900-#xFDCF] | [#xFDF0-#xFFFD] | [#x10000-#xEFFFF] NameChar ::= NameStartChar | "-" | "." | [0-9] | #xB7 | [#x0300-#x036F] | [#x203F-#x2040] Name ::= NameStartChar (NameChar)* </code></pre> <p>Also a separate non-tokenized rule is specified:</p> <blockquote> <p>Names beginning with the string "xml", or with any string which would match (('X'|'x') ('M'|'m') ('L'|'l')), are reserved for standardization in this or future versions of this specification.</p> </blockquote>
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    1. USAnthony
    1. USMike Starov
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    1. CODid you really get that list from w3schools? Rule #1 is very badly phrased; aside from letters and digits, only a very few punctuation characters are allowed in XML names.
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      1. USAlan Moore
    2. COI think the list of constraints is better explained on [this page](http://www.xml.com/pub/a/2001/07/25/namingparts.html) (XML.com).
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      1. USHonza Javorek
    3. COyou might want to doublecheck the w3schools (known to have lots of factual errors on their site) claims against the actual spec of the W3C (not affiliated with w3schools): http://www.w3.org/TR/REC-xml/#dt-element
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      1. USGordon
 

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