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Re: Syntax error in regex pattern

Subject: Re: Syntax error in regex pattern
From: "Scott Vanderbilt lists@xxxxxxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Sat, 13 Jul 2019 17:11:56 -0000
Re:  Syntax error in regex pattern
On 7/13/2019 10:04 AM, Martin Honnen martin.honnen@xxxxxx wrote:

I am trying to use a regex pattern with properties in an xsl:analyze
statement, like this:

B B B B <xsl:analyze-string select="$stringtoproc" regex="\p{L}">

with the intention of capturing letters only. However, when using this
in an XSLT transformation in OxygenXML, I receive the following error:

Syntax error at char 2 in regular expression: Expected '{' after \112

The attribute value is treated as an attribute value template where an expression in curly braces is evaluated as an XPath expression. So either double the curly braces if B B regex="\p{{L}}" or store the value in a variable and use it.

See a section in https://www.w3.org/TR/xslt-30/#analyze-string

Because the regex attribute is an attribute value template, curly
brackets within the regular expression must be doubled. For example, to
match a sequence of one to five characters, write regex=".{{1,5}}". For
regular expressions containing many curly brackets it may be more
convenient to use a notation such as
regex="{'[0-9]{1,5}[a-z]{3}[0-9]{1,2}'}", or to use a variable.

Brilliant. Thank you very much.

Having now gone back to more closely consult my trusted reference source (Michael Kay's magnum opus 'XSLT2.0 and XPath 2.0 [4th ed.]), I see a rather prominently boxed warning on p.231 under "<xsl:analyze-string>" which says precisely what you have pointed out.

If it were a snake, it would have bit me. :-)

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