How to remove XML intendations from XML string.?

Question

I'm having a XML string. I'm not able to remove indentation space from XML string. I replaced newlines.

  <person id="13">
      <name>
          <first>John</first>
          <last>Doe</last>
      </name>
      <age>42</age>
      <Married>false</Married>
      <City>Hanga Roa</City>
      <State>Easter Island</State>
      <!-- Need more details. -->
  </person>

How to remove XML indentation spaces from string in GOLANG?

I want this XML as string like,

<person id="13"><name><first>John</first><last>Doe</last></name><age>42</age><Married>false</Married><City>Hanga Roa</City><State>Easter Island</State><!-- Need more details. --></person>

How to do this in GOLANG?

Answer 1

Remove Whitespace-Only Sequences Between XML Tags

func unformatXML(xmlString string) string {
    var unformatXMLRegEx = regexp.MustCompile(`>\s+<`)
    unformatBetweenTags := unformatXMLRegEx.ReplaceAllString(xmlString, "><") // remove whitespace between XML tags
    return strings.TrimSpace(unformatBetweenTags) // remove whitespace before and after XML
}

RegEx Explanation

\s - matches any whitespace including tab, newline, form feed, carriage return and space

+ - matches one or more of whitespace character

RegEx syntax reference: https://golang.org/pkg/regexp/syntax/

Example

package main

import (
    "fmt"
    "regexp"
    "strings"
)

func main() {
    var s = `    
<person id="13">
    <name>
        <first>John</first>
        <last>Doe</last>
    </name>
    <age>42</age>
    <Married>false</Married>
    <City>Hanga Roa</City>
    <State>Easter Island</State>
    <!-- Need more details. -->
</person>   `

    s = unformatXML(s)
    fmt.Println(fmt.Sprintf("'%s'", s)) // single quotes used to confirm no leading or trailing whitespace
}

func unformatXML(xmlString string) string {
    var unformatXMLRegEx = regexp.MustCompile(`>\s+<`)
    unformatBetweenTags := unformatXMLRegEx.ReplaceAllString(xmlString, "><") // remove whitespace between XML tags
    return strings.TrimSpace(unformatBetweenTags) // remove whitespace before and after XML
}

Runnable Example in Go Playground

https://play.golang.org/p/VS1LRNevicz