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why Perl replaces text when there is no last part after previous: *<hashTree/>. *</hashTree>.? – CentOS

I want to remove by Perl parts of xml file (elements of JMeter test plan) which are:

              <hashTree>
                <JSONPathAssertion guiclass="JSONPathAssertionGui" testclass="JSONPathAssertion" testname="SON-ASS" enabled="true">
                  <stringProp name="JSON_PATH">$.status</stringProp>
                  <stringProp name="EXPECTED_VALUE">ok</stringProp>
                  <boolProp name="JSONVALIDATION">true</boolProp>
                  <boolProp name="EXPECT_NULL">false</boolProp>
                  <boolProp name="INVERT">false</boolProp>
                  <boolProp name="ISREGEX">false</boolProp>
                </JSONPathAssertion>
                <hashTree/>
              </hashTree>

1st time JSONPathAssertion occur in tst.jmx is:

grep -A 10 JSONPath test7.jmx | head -n 10:

</HTTPSamplerProxy>
          <hashTree>
            <JSONPathAssertion guiclass="JSONPathAssertionGui" testclass="JSONPathAssertion" testname="SON-ASS" enabled="true">
              <stringProp name="JSON_PATH">$.status</stringProp>
              <stringProp name="EXPECTED_VALUE">ok</stringProp>
              <boolProp name="JSONVALIDATION">true</boolProp>
              <boolProp name="EXPECT_NULL">false</boolProp>
              <boolProp name="INVERT">false</boolProp>
              <boolProp name="ISREGEX">false</boolProp>
            </JSONPathAssertion>
            <hashTree/>
            <JSR223PreProcessor guiclass="TestBeanGUI" testclass="JSR223PreProcessor" testname="JSR223 PreProcessor" enabled="true">

There is no </hashTree>. after <hashTree/>. separated by spaces only for that 1st occurrence.

I write then: 

cat test7.jmx | perl -0777pe 's` *<hashTree>. *<JSONPathAssertion.*?</JSONPathAssertion>. *<hashTree/>. *</hashTree>.``gs' > test7_1.jmx

Then grep -A 10 JSONPath test7_1.jmx | head -n 10 and now have empty output.
Resulting file does not have JSONPathAssertion at all. Why that particular occurrence was replaced?

P.S. maybe worth separate question, but I could not find how to match single newline character in perl, only as part of larger patterns:

How to match a newline n in a perl regex? .

Regex to match any character including new lines

ADDED after comments:

Full file test7.jmx below (tested again copying contents from SO and pasting in vi to new file), BTW all done on MacOS Mojave, at one iteration confirmed on CentOS 7:

<?xml version="1.0" encoding="UTF-8"?>
<jmeterTestPlan version="1.2" properties="5.0" jmeter="5.1.1 r1855137">
  <hashTree>
    <TestPlan guiclass="TestPlanGui" testclass="TestPlan" testname="test one" enabled="true">
      <stringProp name="TestPlan.comments"></stringProp>
      <boolProp name="TestPlan.functional_mode">false</boolProp>
      <boolProp name="TestPlan.tearDown_on_shutdown">true</boolProp>
      <boolProp name="TestPlan.serialize_threadgroups">false</boolProp>
      <elementProp name="TestPlan.user_defined_variables" elementType="Arguments" guiclass="ArgumentsPanel" testclass="Arguments" testname="User Defined Variables" enabled="true">
        <collectionProp name="Arguments.arguments"/>
      </elementProp>
      <stringProp name="TestPlan.user_define_classpath"></stringProp>
    </TestPlan>
    <hashTree>
      <com.blazemeter.jmeter.threads.concurrency.ConcurrencyThreadGroup guiclass="com.blazemeter.jmeter.threads.concurrency.ConcurrencyThreadGroupGui" testclass="com.blazemeter.jmeter.threads.concurrency.ConcurrencyThreadGroup" testname="Thread - main" enabled="true">
        <elementProp name="ThreadGroup.main_controller" elementType="com.blazemeter.jmeter.control.VirtualUserController"/>
        <stringProp name="ThreadGroup.on_sample_error">continue</stringProp>
        <stringProp name="TargetLevel">${__P(threads, 1)}</stringProp>
        <stringProp name="RampUp">${__P(time, 1)}</stringProp>
        <stringProp name="Steps">${__P(steps, 1)}</stringProp>
        <stringProp name="Hold">${__P(hold, 3)}</stringProp>
        <stringProp name="LogFilename"></stringProp>
        <stringProp name="Iterations"></stringProp>
        <stringProp name="Unit">M</stringProp>
      </com.blazemeter.jmeter.threads.concurrency.ConcurrencyThreadGroup>
      <hashTree>
        <GenericController guiclass="LogicControllerGui" testclass="GenericController" testname="Simple Controller - main" enabled="true"/>
        <hashTree>
          <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="REQUEST1" enabled="true">
            <boolProp name="HTTPSampler.postBodyRaw">true</boolProp>
            <elementProp name="HTTPsampler.Arguments" elementType="Arguments">
              <collectionProp name="Arguments.arguments">
                <elementProp name="" elementType="HTTPArgument">
                  <boolProp name="HTTPArgument.always_encode">false</boolProp>
                  <stringProp name="Argument.value">{&#xd;
    &quot;version&quot;: &quot;1.1&quot;,&#xd;
    &quot;test&quot;: {&#xd;
}</stringProp>
                  <stringProp name="Argument.metadata">=</stringProp>
                </elementProp>
              </collectionProp>
            </elementProp>
            <stringProp name="HTTPSampler.domain"></stringProp>
            <stringProp name="HTTPSampler.port"></stringProp>
            <stringProp name="HTTPSampler.protocol"></stringProp>
            <stringProp name="HTTPSampler.contentEncoding"></stringProp>
            <stringProp name="HTTPSampler.path"></stringProp>
            <stringProp name="HTTPSampler.method">POST</stringProp>
            <boolProp name="HTTPSampler.follow_redirects">false</boolProp>
            <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
            <boolProp name="HTTPSampler.use_keepalive">true</boolProp>
            <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
            <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
            <stringProp name="HTTPSampler.connect_timeout"></stringProp>
            <stringProp name="HTTPSampler.response_timeout"></stringProp>
          </HTTPSamplerProxy>
          <hashTree>
            <JSONPathAssertion guiclass="JSONPathAssertionGui" testclass="JSONPathAssertion" testname="JSON Assertion" enabled="true">
              <stringProp name="JSON_PATH">$.status</stringProp>
              <stringProp name="EXPECTED_VALUE">ok</stringProp>
              <boolProp name="JSONVALIDATION">true</boolProp>
              <boolProp name="EXPECT_NULL">false</boolProp>
              <boolProp name="INVERT">false</boolProp>
              <boolProp name="ISREGEX">false</boolProp>
            </JSONPathAssertion>
            <hashTree/>
            <JSR223PreProcessor guiclass="TestBeanGUI" testclass="JSR223PreProcessor" testname="JSR223 PreProcessor" enabled="true">
              <stringProp name="cacheKey">true</stringProp>
              <stringProp name="filename"></stringProp>
              <stringProp name="parameters"></stringProp>
              <stringProp name="script">// period in the past - year-month-day, set from properties in User Defined Variables

import java.time.Instant;
import java.time.temporal.ChronoUnit;
import groovy.json.JsonOutput;
import org.apache.commons.lang.RandomStringUtils;</stringProp>
              <stringProp name="scriptLanguage">groovy</stringProp>
            </JSR223PreProcessor>
            <hashTree/>
            <JSR223PostProcessor guiclass="TestBeanGUI" testclass="JSR223PostProcessor" testname="JSR223 PostProcessor" enabled="true">
              <stringProp name="cacheKey">true</stringProp>
              <stringProp name="filename"></stringProp>
              <stringProp name="parameters"></stringProp>
              <stringProp name="script">import java.time.Instant;
import java.time.temporal.ChronoUnit;</stringProp>
              <stringProp name="scriptLanguage">groovy</stringProp>
            </JSR223PostProcessor>
            <hashTree/>
          </hashTree>
          <IfController guiclass="IfControllerPanel" testclass="IfController" testname="If Controller" enabled="true">
            <stringProp name="IfController.condition">${__groovy(${random_variable} == 1)}</stringProp>
            <boolProp name="IfController.evaluateAll">false</boolProp>
            <boolProp name="IfController.useExpression">true</boolProp>
          </IfController>
          <hashTree>
            <RandomController guiclass="RandomControlGui" testclass="RandomController" testname="Random Controller" enabled="true">
              <intProp name="InterleaveControl.style">1</intProp>
            </RandomController>
            <hashTree>
              <HTTPSamplerProxy guiclass="HttpTestSampleGui" testclass="HTTPSamplerProxy" testname="REQUEST2" enabled="true">
                <boolProp name="HTTPSampler.postBodyRaw">true</boolProp>
                <elementProp name="HTTPsampler.Arguments" elementType="Arguments">
                  <collectionProp name="Arguments.arguments">
                    <elementProp name="" elementType="HTTPArgument">
                      <boolProp name="HTTPArgument.always_encode">false</boolProp>
                      <stringProp name="Argument.value">{&#xd;
    &quot;version&quot;: &quot;1.1&quot;,&#xd;
    &quot;test&quot;: {&#xd;
}</stringProp>
                      <stringProp name="Argument.metadata">=</stringProp>
                    </elementProp>
                  </collectionProp>
                </elementProp>
                <stringProp name="HTTPSampler.domain"></stringProp>
                <stringProp name="HTTPSampler.port"></stringProp>
                <stringProp name="HTTPSampler.protocol"></stringProp>
                <stringProp name="HTTPSampler.contentEncoding"></stringProp>
                <stringProp name="HTTPSampler.path"></stringProp>
                <stringProp name="HTTPSampler.method">POST</stringProp>
                <boolProp name="HTTPSampler.follow_redirects">false</boolProp>
                <boolProp name="HTTPSampler.auto_redirects">false</boolProp>
                <boolProp name="HTTPSampler.use_keepalive">true</boolProp>
                <boolProp name="HTTPSampler.DO_MULTIPART_POST">false</boolProp>
                <stringProp name="HTTPSampler.embedded_url_re"></stringProp>
                <stringProp name="HTTPSampler.connect_timeout"></stringProp>
                <stringProp name="HTTPSampler.response_timeout"></stringProp>
              </HTTPSamplerProxy>
              <hashTree>
                <JSONPathAssertion guiclass="JSONPathAssertionGui" testclass="JSONPathAssertion" testname="JSON Assertion" enabled="true">
                  <stringProp name="JSON_PATH">$.status</stringProp>
                  <stringProp name="EXPECTED_VALUE">ok</stringProp>
                  <boolProp name="JSONVALIDATION">true</boolProp>
                  <boolProp name="EXPECT_NULL">false</boolProp>
                  <boolProp name="INVERT">false</boolProp>
                  <boolProp name="ISREGEX">false</boolProp>
                </JSONPathAssertion>
                <hashTree/>
              </hashTree>
            </hashTree>
          </hashTree>
        </hashTree>
      </hashTree>
    </hashTree>
  </hashTree>
</jmeterTestPlan>
Tags:

2

Answers


  1. Chosen as BEST ANSWER
    0

    The reason for incorrect work of Perl one-liner in question was discovered by ikegami. For future reference I post correct code in Perl:

    cat test.jmx | perl -0777pe 's` *<hashTree>n( *)<JSONPathAssertion.*n.*n.*n.*n.*n.*n.*n *</JSONPathAssertion>n *(<hashTree/>)n *</hashTree>n`$1$2`g' > test_.jmx

    I noted only today that (as far as I noted) all elements of JMeter test plan xml tree should end with <hashTree> for child elements. If no elements present, than empty branch should be written: <hashTree/>: therefore when deleting element which is single in a branch, its' code should be replaced by code for empty branch: <hashTree/>.


  2. 0

    This shows what is being matched. The entire highlighted portion of the text is just one match. The .*? is matching more than you intend it to.

    I would use a proper XML parser.

    use XML::LibXML qw( );

my $xpath = "
   //hashTree[
      count(*)=2 and
      *[position()=1 and name()='JSONPathAssertion'] and
      *[position()=2 and name()='hashTree' and count(*)=0]
   ]
";

my $doc = XML::LibXML->new->parse_file("a.xml");
$_->unlink for $doc->findnodes($xpath);
$doc->toFile("b.xml");

    or

    use XML::LibXML qw( );

my $doc = XML::LibXML->new->parse_file("a.xml");
for my $node ($doc->findnodes("//hashTree")) {
   my @child_eles = $node->findnodes("*");
   $node->unlink
      if @child_eles == 2
      && $child_eles[0]->nodeName eq "JSONPathAssertion"
      && $child_eles[1]->nodeName eq "hashTree"
      && $child_eles[1]->findnodes("*")->size == 0;
}

$doc->toFile("b.xml");
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