Subject: Re: [xsl] xslt 2.0 regex From: Brandon Ibach <brandon.ibach@xxxxxxxxxxxxxxxxxxx> Date: Sat, 17 Mar 2012 14:13:22 -0400 |
On Sat, Mar 17, 2012 at 2:01 PM, davep <davep@xxxxxxxxxxxxx> wrote: > On 17/03/12 17:38, Brandon Ibach wrote: >> Ignoring that for the moment, though, Tony pointed out one consequence >> of this, but the bigger issue is that the "|" operator in regex is >> fairly low precedence, so you often need some parenthesis around the >> list of alternatives to get things right. Your NameStartChar.re has a >> hex-char-ref-encoded "$" at the beginning, so that regex is actually >> "$[A-Z] | _ | [a-z] | ...", which means it will match "(a dollar sign >> followed by an upper-case English letter) or (an underscore) or (a >> lower-case English letter) or ...". > > Which is correct (less the missing :), that's what they call the startChar? Not quite. Notice the parens I put in the "translation". The dollar sign is only matched when it is followed by an upper-case English letter. A variable name starting with anything else won't match correctly. You'd need parens around the list of alternatives to make sure the "|" only applies to the upper-case-letter pattern and not the dollar sign. Since you re-use NameStartChar.re in NameChar.re, however, that won't work. Moving the dollar sign to Name.re solves that problem. >> All that said, I got this to work by dropping the "$" from the start >> of NameStartChar.re and changing Name.re to: >> >> concat("\$(", $NameStartChar.re, ")(", $NameChar.re,")*") > > presumably because $ is within the a-z grouping.... > Yes it works. > > It should be possible (and simpler) to use Tony's idea \i\c+ since : is a > valid variable name. Not a syntax I've used before I think? QName is actually defined (in more EBNC-like notation) as "(NCName ':')? NCName", which allows only one ":" under specific circumstances, so your best bet is probably something like this, based on Tony's later version: ([\i-[:]][\c-[:]]*:)?[\i-[:]][\c-[:]]* -Brandon :)
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