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$regex = '\["(Total|Group1|Group2)",(\d+),\d*,,,,,\d+,\d+\]'
$test_str = @"
<script type="text/javascript">
   var resourceFolder = "Test_Results_20240621_0910";
   var blockSize = 50000;
   block0 = [["Total",47,,,,,,1,2],["Group1",29,0,,,,,3,5],["Group2",52,0,,,,,8,4]];
   coverageData = [block0];
</script>
"@
 
$matches = [regex]::Matches($test_str, $regex)
 
for ($i = 0; $i -lt $matches.Count; $i++) {
    $match = $matches[$i]
    Write-Host "Match $($i + 1) was found at $($match.Index)-$($match.Index + $match.Length): $($match.Value)"
 
    for ($j = 1; $j -le $match.Groups.Count; $j++) {
        $group = $match.Groups[$j]
        Write-Host "Group $j found at $($group.Index)-$($group.Index + $group.Length): $($group.Value)"
    }
}

Main.java:1: error: class, interface, or enum expected
$regex = '\["(Total|Group1|Group2)",(\d+),\d*,,,,,\d+,\d+\]'
^
Main.java:1: error: illegal escape character
$regex = '\["(Total|Group1|Group2)",(\d+),\d*,,,,,\d+,\d+\]'
           ^
Main.java:1: error: unclosed character literal
$regex = '\["(Total|Group1|Group2)",(\d+),\d*,,,,,\d+,\d+\]'
         ^
Main.java:1: error: illegal character: '\'
$regex = '\["(Total|Group1|Group2)",(\d+),\d*,,,,,\d+,\d+\]'
                                     ^
Main.java:1: error: illegal character: '\'
$regex = '\["(Total|Group1|Group2)",(\d+),\d*,,,,,\d+,\d+\]'
                                          ^
Main.java:1: error: illegal character: '\'
$regex = '\["(Total|Group1|Group2)",(\d+),\d*,,,,,\d+,\d+\]'
                                                  ^
Main.java:1: error: illegal character: '\'
$regex = '\["(Total|Group1|Group2)",(\d+),\d*,,,,,\d+,\d+\]'
                                                      ^
Main.java:1: error: illegal character: '\'
$regex = '\["(Total|Group1|Group2)",(\d+),\d*,,,,,\d+,\d+\]'
                                                         ^
Main.java:1: error: illegal line end in character literal
$regex = '\["(Total|Group1|Group2)",(\d+),\d*,,,,,\d+,\d+\]'
                                                           ^
Main.java:2: error: unclosed string literal
$test_str = @"
             ^
Main.java:3: error: class, interface, or enum expected
<script type="text/javascript">
 ^
Main.java:5: error: class, interface, or enum expected
   var blockSize = 50000;
   ^
Main.java:6: error: class, interface, or enum expected
   block0 = [["Total",47,,,,,,1,2],["Group1",29,0,,,,,3,5],["Group2",52,0,,,,,8,4]];
   ^
Main.java:7: error: class, interface, or enum expected
   coverageData = [block0];
   ^
Main.java:8: error: class, interface, or enum expected
</script>
^
Main.java:9: error: unclosed string literal
"@
^
Main.java:13: error: class, interface, or enum expected
for ($i = 0; $i -lt $matches.Count; $i++) {
             ^
Main.java:13: error: class, interface, or enum expected
for ($i = 0; $i -lt $matches.Count; $i++) {
                                    ^
Main.java:17: error: class, interface, or enum expected
    for ($j = 1; $j -le $match.Groups.Count; $j++) {
                 ^
Main.java:17: error: class, interface, or enum expected
    for ($j = 1; $j -le $match.Groups.Count; $j++) {
                                             ^
20 errors

Standard output is empty