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Regular Expression with Multiple Matches and Named Capture Groups

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Demonstrates regular expressions with named capture groups and multiple matches. PowerShell

Add-Type -Path "C:\chilkat\ChilkatDotNet47-x64\ChilkatDotNet47.dll"

$success = $false

$sb = New-Object Chilkat.StringBuilder
$crlf = $true
$sb.AppendLine("Name: John Smith",$crlf)
$sb.AppendLine("Name: Jack Johnson",$crlf)
$sb.AppendLine("Name: Mary Adams",$crlf)

$($sb.GetAsString())

#  We have the following string:
#  Name: John Smith
#  Name: Jack Johnson
#  Name: Mary Adams

$pattern = "Name:\\s+(?<first>\\w+)\\s+(?<last>\\w+)"
$json = New-Object Chilkat.JsonObject
$json.EmitCompact = $false

$timeoutMs = 2000
$numMatches = $sb.RegexMatch($pattern,$json,$timeoutMs)
if ($numMatches -lt 0) {
    #  Probably an error in the regular expression.
    #  Suggestion: Use AI to help create and/or diagnose regular expressions.
    $($sb.LastErrorText)
    exit
}

#  Examine the matches:
$($json.Emit())

#  Here is the JSON showing the matches.
#  Important:  Capture group 0 always contains the entire match — that is, the portion of the input string that matches the full regular expression.

#  {
#    "named": {
#      "first": 1,
#      "last": 2
#    },
#    "match": [
#      {
#        "group": [
#          {
#            "cap": "Name: John Smith",
#            "idx": 0,
#            "len": 16
#          },
#          {
#            "cap": "John",
#            "idx": 6,
#            "len": 4
#          },
#          {
#            "cap": "Smith",
#            "idx": 11,
#            "len": 5
#          }
#        ]
#      },
#      {
#        "group": [
#          {
#            "cap": "Name: Jack Johnson",
#            "idx": 18,
#            "len": 18
#          },
#          {
#            "cap": "Jack",
#            "idx": 24,
#            "len": 4
#          },
#          {
#            "cap": "Johnson",
#            "idx": 29,
#            "len": 7
#          }
#        ]
#      },
#      {
#        "group": [
#          {
#            "cap": "Name: Mary Adams",
#            "idx": 38,
#            "len": 16
#          },
#          {
#            "cap": "Mary",
#            "idx": 44,
#            "len": 4
#          },
#          {
#            "cap": "Adams",
#            "idx": 49,
#            "len": 5
#          }
#        ]
#      }
#    ]
#  }

#  The capture group index is obtained by looking up the name in the JSON result.
#  For example:

$idx_first = $json.IntOf("named.first")
$idx_last = $json.IntOf("named.last")

$i = 0
$matchCount = $json.SizeOfArray("match")
while ($i -lt $matchCount) {
    $("Match " + $i + 1 + ":")
    $json.I = $i

    $json.J = $idx_first
    $("first: " + $json.StringOf("match[i].group[j].cap"))

    $json.J = $idx_last
    $("first: " + $json.StringOf("match[i].group[j].cap"))

    $("")
    $i = $i + 1
}

#  Output is: 

#  Match 1:
#  first: John
#  first: Smith
#  
#  Match 2:
#  first: Jack
#  first: Johnson
#  
#  Match 3:
#  first: Mary
#  first: Adams