Home With regex how would I delete all the same elements except the first element in javascript?

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With regex how would I delete all the same elements except the first element in javascript?

February 22, 2023

How would I delete all the <Document> elements except the first one ?
With a regular expression it would be suitable but don’t know how to do that

\<?xml version="1.0"?\>
\<kml xmlns="http://www.opengis.net/kml/2.2"\>  
\<Document\>        
\<name\>Traverse path TRV_1_PATH_1\</name\>
\<Placemark\>   
\<name\>Traverse path TRV_1_PATH_1\</name\>             
\<LineString\>              
\<coordinates\>                     
\-13.701582,29.043733,0 -13.702719,29.043939,0 -13.704522,29.043846,0 -13.704886,29.043939,0 -13.705208,29.043733,0 -13.705723,29.043827,0 -13.705852,29.04362,0 -13.706088,29.043789,0 -13.70656,29.043489,0 -13.707612,29.043902,0 -13.708019,29.043827,0 -13.708534,29.044296,0 -13.709564,29.044221,0 -13.710144,29.04469,0 -13.71141,29.045177,0 -13.712161,29.04514,0 -13.712611,29.045515,0 -13.713255,29.045177,0 -13.714392,29.044877,0 -13.714457,29.044446,0 -13.715315,29.044033,0
\</coordinates\>                    
\</LineString\>                 
\</Placemark\>  
\<Document\>        
\<name\>Traverse path TRV_1_PATH_2\</name\>         
\<Placemark\>           
\<name\>Traverse path TRV_1_PATH_2\</name\>             
\<LineString\>              
\<coordinates\>                     
\-13.715379,29.043996,0 -13.716795,29.044465,0 -13.718061,29.044202,0 -13.718662,29.043902,0 -13.718619,29.043433,0 -13.71922,29.04347,0 -13.719907,29.043001,0 -13.7204,29.042213,0
\</coordinates\>
\</LineString\>
\</Placemark\>  
\<Document\>        
\<name\>Traverse path TRV_1_PATH_3\</name\>         
\<Placemark\>           
\<name\>Traverse path TRV_1_PATH_3\</name\>             
\<LineString\>              
\<coordinates\>                     
\-13.7204,29.042138,0 -13.720615,29.041407,0 -13.721237,29.041144,0 -13.721838,29.041275,0 -13.722396,29.040994,0 -13.723104,29.041613,0 -13.725228,29.042945,0 -13.727052,29.043977,0 -13.729327,29.044521,0 -13.731387,29.044352,0 -13.732653,29.043414,0 -13.733554,29.04197,0
\</coordinates\>                    
\</LineString\>                 
\</Placemark\>  
\<Document\>        
\<name\>Traverse path TRV_1_PATH_4\</name\>         
\<Placemark\>           
\<name\>Traverse path TRV_1_PATH_4\</name\>             
\<LineString\>              
\<coordinates\>                     
\-13.733683,29.041913,0 -13.734305,29.041763,0 -13.734434,29.042026,0 -13.73394,29.043076,0 -13.733554,29.044202,0 -13.733447,29.045252,0
\</coordinates\>                    
\</LineString\>                 
\</Placemark\>
\</Document\>
\</kml\>

I tried with posite lookahead but didnt work :

let test = myxml.replace((/(?!^)<Document>/g, '')); console.log(test);

Any idea ?

>Solution :

Although your xml format is valid. I try to delete all beside the first.

var documentCount = 0;
var str = `\<?xml version="1.0"?\>
\<kml xmlns="http://www.opengis.net/kml/2.2"\>  
\<Document\>        
\<name\>Traverse path TRV_1_PATH_1\</name\>
\<Placemark\>   
\<name\>Traverse path TRV_1_PATH_1\</name\>             
\<LineString\>              
\<coordinates\>                     
\-13.701582,29.043733,0 -13.702719,29.043939,0 -13.704522,29.043846,0 -13.704886,29.043939,0 -13.705208,29.043733,0 -13.705723,29.043827,0 -13.705852,29.04362,0 -13.706088,29.043789,0 -13.70656,29.043489,0 -13.707612,29.043902,0 -13.708019,29.043827,0 -13.708534,29.044296,0 -13.709564,29.044221,0 -13.710144,29.04469,0 -13.71141,29.045177,0 -13.712161,29.04514,0 -13.712611,29.045515,0 -13.713255,29.045177,0 -13.714392,29.044877,0 -13.714457,29.044446,0 -13.715315,29.044033,0
\</coordinates\>                    
\</LineString\>                 
\</Placemark\>  
\<Document\>        
\<name\>Traverse path TRV_1_PATH_2\</name\>         
\<Placemark\>           
\<name\>Traverse path TRV_1_PATH_2\</name\>             
\<LineString\>              
\<coordinates\>                     
\-13.715379,29.043996,0 -13.716795,29.044465,0 -13.718061,29.044202,0 -13.718662,29.043902,0 -13.718619,29.043433,0 -13.71922,29.04347,0 -13.719907,29.043001,0 -13.7204,29.042213,0
\</coordinates\>
\</LineString\>
\</Placemark\>  
\<Document\>        
\<name\>Traverse path TRV_1_PATH_3\</name\>         
\<Placemark\>           
\<name\>Traverse path TRV_1_PATH_3\</name\>             
\<LineString\>              
\<coordinates\>                     
\-13.7204,29.042138,0 -13.720615,29.041407,0 -13.721237,29.041144,0 -13.721838,29.041275,0 -13.722396,29.040994,0 -13.723104,29.041613,0 -13.725228,29.042945,0 -13.727052,29.043977,0 -13.729327,29.044521,0 -13.731387,29.044352,0 -13.732653,29.043414,0 -13.733554,29.04197,0
\</coordinates\>                    
\</LineString\>                 
\</Placemark\>  
\<Document\>        
\<name\>Traverse path TRV_1_PATH_4\</name\>         
\<Placemark\>           
\<name\>Traverse path TRV_1_PATH_4\</name\>             
\<LineString\>              
\<coordinates\>                     
\-13.733683,29.041913,0 -13.734305,29.041763,0 -13.734434,29.042026,0 -13.73394,29.043076,0 -13.733554,29.044202,0 -13.733447,29.045252,0
\</coordinates\>                    
\</LineString\>                 
\</Placemark\>
\</Document\>
\</kml\>`.replace(/<Document>/g, ()=>{
return documentCount++===0? '<Document>':''
})
console.log(str);