[Info-vax] DCL and scripting

[Arne Vajhøj]

On 12/12/2018 8:58 PM, Arne Vajhøj wrote:
> On 12/12/2018 8:34 PM, Dave Froble wrote:
>> On 12/12/2018 7:49 PM, Arne Vajhøj wrote:
>>> Regex is a bit cryptic. But it can be useful.
>>>
>>> But I will say that all programmers should know SQL, regex and XPath.
>>
>> I know some SQL.  I don't even know what regex and xpath is.
> 
> regex is a way to find patterns in text.
> 
> XPath is a way to select parts of an XML document.
> 
>>                                                              I guess 
>> according to you I should stick to flying.  Oh well, much more fun 
>> anyway.
>>
>> Now if it would just warm up ....
> 
> Or maybe something to study during Christmas vacation.
> 
> :-)

Simple XPath example in VB.NET:

Imports System
Imports System.Xml

Namespace DF2
     Public Class Program
         Public Shared Sub Main(args As String())
             Dim xml As String = "<all>" & vbCrLf & _
                 "    <one>" & vbCrLf & _
                 "        <a id=""1""/>" & vbCrLf & _
                 "        <b>A</b>" & vbCrLf & _
                 "    </one>" & vbCrLf & _
                 "    <one>" & vbCrLf & _
                 "        <a id=""2""/>" & vbCrLf & _
                 "        <b>BB</b>" & vbCrLf & _
                 "    </one>" & vbCrLf & _
                 "    <one>" & vbCrLf & _
                 "        <a id=""3""/>" & vbCrLf & _
                 "        <b>CCC</b>" & vbCrLf & _
                 "    </one>" & vbCrLf & _
                 "</all>"
             Console.WriteLine(xml)
             Dim doc As New XmlDocument()
             doc.LoadXml(xml)
             For Each n As XmlNode In doc.SelectNodes("/all/one")
                 Console.WriteLine(n.SelectSingleNode("a/@id").Value & " 
" & n.SelectSingleNode("b/text()").Value)
             Next
         End Sub
     End Class
End Namespace

Output:

<all>
     <one>
         <a id="1"/>
         <b>A</b>
     </one>
     <one>
         <a id="2"/>
         <b>BB</b>
     </one>
     <one>
         <a id="3"/>
         <b>CCC</b>
     </one>
</all>
1 A
2 BB
3 CCC

Arne