Perl Requires Chilkat v11.1.0+

Regular Expression with Multiple Matches and Named Capture Groups

See more Regular Expressions Examples

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

use chilkat();

$success = 0;

$sb = chilkat::CkStringBuilder->new();
$crlf = 1;
$sb->AppendLine("Name: John Smith",$crlf);
$sb->AppendLine("Name: Jack Johnson",$crlf);
$sb->AppendLine("Name: Mary Adams",$crlf);

print $sb->getAsString() . "\r\n";

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

$pattern = "Name:\\s+(?<first>\\w+)\\s+(?<last>\\w+)";
$json = chilkat::CkJsonObject->new();
$json->put_EmitCompact(0);

$timeoutMs = 2000;
$numMatches = $sb->RegexMatch($pattern,$json,$timeoutMs);
if ($numMatches < 0) {
    #  Probably an error in the regular expression.
    #  Suggestion: Use AI to help create and/or diagnose regular expressions.
    print $sb->lastErrorText() . "\r\n";
    exit;
}

#  Examine the matches:
print $json->emit() . "\r\n";

#  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 < $matchCount) {
    print "Match " . ($i + 1) . ":" . "\r\n";
    $json->put_I($i);

    $json->put_J($idx_first);
    print "first: " . $json->stringOf("match[i].group[j].cap") . "\r\n";

    $json->put_J($idx_last);
    print "first: " . $json->stringOf("match[i].group[j].cap") . "\r\n";

    print "" . "\r\n";
    $i = $i + 1;
}

#  Output is: 

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