Perl Requires Chilkat v11.1.0+

Regular Expression Replace Full Matches

See more Regular Expressions Examples

Demonstrates replacing the full matches of a regular expression.

Note: Chilkat uses PCRE2. See PCRE2 Regular Expressions
Also see: PCRE2 Performance

Chilkat2 Perl

use strict;
use warnings;
use Chilkat2;

my $subject = 'John Anders, +_+_+ Mary Robins $$$$';
my $pattern = '\w+\s+\w+';

my $sb = Chilkat2::StringBuilder->new;
$sb->Append($subject);

my $json = Chilkat2::JsonObject->new;
$json->EmitCompact(0);

my $timeoutMs = 2000;
my $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, "\n";
    exit;
}

# Examine the matches:
print $json->Emit(), "\n";

# {
#   "match": [
#     {
#       "group": [
#         {
#           "cap": "John Anders",
#           "idx": 0,
#           "len": 11
#         }
#       ]
#     },
#     {
#       "group": [
#         {
#           "cap": "Mary Robins",
#           "idx": 19,
#           "len": 11
#         }
#       ]
#     }
#   ]
# }

my $sbTemp = Chilkat2::StringBuilder->new;

my $i = 0;
$numMatches = $json->SizeOfArray('match');
while ($i < $numMatches) {
    $json->I($i);

    # The full match is always in group 0.
    $sbTemp->Clear();
    $json->StringOfSb('match[i].group[0].cap', $sbTemp);

    # Indicate that we wish to replace the full match with it's value converted to uppercase.
    $sbTemp->ToUppercase();
    $json->UpdateSb('match[i].group[0].rep', $sbTemp);

    $i = $i + 1;
}

# The JSON now has replacement strings:
print $json->Emit(), "\n";

# {
#   "match": [
#     {
#       "group": [
#         {
#           "cap": "John Anders",
#           "idx": 0,
#           "len": 11,
#           "rep": "JOHN ANDERS"
#         }
#       ]
#     },
#     {
#       "group": [
#         {
#           "cap": "Mary Robins",
#           "idx": 19,
#           "len": 11,
#           "rep": "MARY ROBINS"
#         }
#       ]
#     }
#   ]
# }

# Call RegexReplace to update the StringBuilder with the replacements.
my $success = $sb->RegexReplace($json);
if (!$success) {
    print $sb->LastErrorText, "\n";
    exit;
}

print "Result after doing replacements:\n";
print $sb->GetAsString(), "\n";

# Result after doing replacements:
# JOHN ANDERS, +_+_+ MARY ROBINS $$$$