Subject: Re: [xsl] How to escape the normal interpretation of parentheses when utilizing regex-group()? From: "David Carlisle d.p.carlisle@xxxxxxxxx" <xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> Date: Wed, 24 May 2023 11:20:49 -0000 |
On Wed, 24 May 2023 at 12:00, Roger L Costello costello@xxxxxxxxx < xsl-list-service@xxxxxxxxxxxxxxxxxxxxxx> wrote: > Hi Folks, > > My input consist of lines of text. Here is a sample input: > > 1 Record Type > > The XSLT program is to transform that line into this XML: > > <column>1</column> > <field-name>Record Type</field-name> > > Here is another sample input: > > 2 thru 4 Customer/Area Code > > The XSLT program is to transform that line into this XML: > > <column>2 thru 4</column> > <field-name>Customer/Area Code</field-name> > > I figured that <xsl:analyze-string and regex-group() would be suitable for > breaking apart each line. > > What regex to use for column? The value of column is an integer followed > optionally by "thru" and another integer. I figured this regex should do > the job: > > ([0-9]+(\s+thru\s+[0-9]+)?) > > But, but, but, .... > > regex-group(1) means that whole regex. So with this input: > > 2 thru 4 Customer/Area Code > > regex-group(1) matches: > > 2 thru 4 > > Perfect. > > Unfortunately, regex-group(2) matches the inner, optional part. So I end > up with this: > > <column>2 thru 4</column> > <field-name> thru 4</field-name> > > Eek! > > Wrong. > > How to solve this problem? Is there a way to specify that the inner, > optional part: > > (\s+thru\s+[0-9]+)? > > belongs only to regex-group(1), not to regex-group(2)? > > Stated another way, is there a way to indicate that the parentheses in the > inner, optional part are not to be considered as regex-group() syntax? > > Stated still another way, is there a way to "escape" the normal > interpretation of parentheses when utilizing regex-group()? > You could use non capturing group but no real need here, you haven't shown any regex matching the second column, something like ^\s*([0-9]+(\s+thru\s+[0-9]+)?)\s*(.*)$ then your columns are groups 1 and 3 > /Roger
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