Subject: Re: [xsl] XPath to check that a middle initial is either empty or is a letter followed by a period From: "David Carlisle d.p.carlisle@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Thu, 2 Jun 2016 12:45:23 -0000 |
On 2 June 2016 at 13:33, Costello, Roger L. costello@xxxxxxxxx < xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > Hi Folks, > > I need an XPath expression that returns true if the <MI> element is empty > or, if it's not empty, it contains an uppercase letter of the English > alphabet followed by a period. For example, this <MI> element is good: > > <MI></MI> > > As is this: > > <MI>H.</MI> > > This XPath seems to work fine: > > if (MI eq '') then true() > else if (exists(MI)) then matches(MI, '^[A-Z]\.$') > else true() > > Is there a better (shorter, simpler, more robust) XPath expression? > > /Roger > you don't need the if tests, (you almost never need an if test returning true() just MI='' or matches(string(MI), '^[A-Z]\.$') or if you prefer matches(string(MI), '^([A-Z]\.)?$') David
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