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Re: Special characters in regex expression

Subject: Re: Special characters in regex expression
From: "Michael Dykman mdykman@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx>
Date: Wed, 23 Jul 2014 20:21:15 -0000
Re:  Special characters in regex expression
It is my understanding that Java' regular expression builtin emulates
'pcre' pretty closely.

To escape spacial characters that have special meaning in a regular
expression, defining it as a character class (using the square bracket
notation) generally works

ie. if you want to match a question mark at the beginning of a line,
use:  "^[?].*$"

On Wed, Jul 23, 2014 at 3:55 PM, mike@xxxxxxxxxxxx
<xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote:
> Exclamation mark is not a special character in XPath regular expressions,
> and there does not need to be (and must not be) escaped.
> Negative lookaheads are not supported in the XPath regular expression
> dialect.
> You can't assume that all regular expression dialects are the same.
> Michael Kay
> Saxonica
>> Dear All,
>> I am using xsl:analyze-string to retrieve and replace punctuation,
>> however, I got the following error:
>>  Error in regular expression: net.sf.saxon.trans.XPathException: Syntax
>> error at char 6 in regular expression: Escape character '!' not allowed.
>> How should I escape and match '?' and '!' ? I am also using a negative
>> look-ahead, why isn't that working?
>> Here is a sample from my code, thanks,
>> Gabor
>> <xsl:template match="//TEI:p//text()[ not
>>         ((parent::TEI:note)|(parent::TEI:hi)|(parent::TEI:date))]">
>>  <xsl:analyze-string select="." regex="(\.|\!|\?)(?!\)|\.|\d|\w)">
>>             <xsl:matching-substring>
>>                 <xsl:element name="seg"
>> namespace="http://www.tei-c.org/ns/1.0"><xsl:value-of
>> select="."/></xsl:element>
>>            </xsl:matching-substring>
>>             <xsl:non-matching-substring>
>>                 <xsl:value-of select="."/>
>>             </xsl:non-matching-substring>
>>         </xsl:analyze-string>
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 - michael dykman
 - mdykman@xxxxxxxxx

 May the Source be with you.

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