diff --git a/module/VuFindConsole/src/VuFindConsole/Command/Language/CopyStringCommand.php b/module/VuFindConsole/src/VuFindConsole/Command/Language/CopyStringCommand.php
index 1701b370d9149c11ed8e3360136db6d7f52a42de..8aab056b80fdce3a9230ca3532252dfcccc772fc 100644
--- a/module/VuFindConsole/src/VuFindConsole/Command/Language/CopyStringCommand.php
+++ b/module/VuFindConsole/src/VuFindConsole/Command/Language/CopyStringCommand.php
@@ -29,6 +29,7 @@ namespace VuFindConsole\Command\Language;
 
 use Symfony\Component\Console\Input\InputArgument;
 use Symfony\Component\Console\Input\InputInterface;
+use Symfony\Component\Console\Input\InputOption;
 use Symfony\Component\Console\Output\OutputInterface;
 
 /**
@@ -68,6 +69,18 @@ class CopyStringCommand extends AbstractCommand
                 'target',
                 InputArgument::REQUIRED,
                 'the target key to write ' . $note
+            )->addOption(
+                'replace',
+                null,
+                InputOption::VALUE_REQUIRED,
+                'string delimited by replaceDelimiter option, representing '
+                . "search-and-replace operation.\ne.g. textToReplace/replacementText"
+            )->addOption(
+                'replaceDelimiter',
+                null,
+                InputOption::VALUE_REQUIRED,
+                'delimiter used in replace option',
+                '/'
             );
     }
 
@@ -90,6 +103,20 @@ class CopyStringCommand extends AbstractCommand
         fclose($fHandle);
     }
 
+    /**
+     * Apply a replacement rule, if necessary.
+     *
+     * @param string $text Text to transform
+     * @param array  $rule Replacement rule (empty for no change; [text to replace,
+     * replacement] array to apply a transformation)
+     *
+     * @return string
+     */
+    protected function applyReplaceRule(string $text, array $rule): string
+    {
+        return empty($rule) ? $text : str_replace($rule[0], $rule[1], $text);
+    }
+
     /**
      * Run the command.
      *
@@ -102,6 +129,9 @@ class CopyStringCommand extends AbstractCommand
     {
         $source = $input->getArgument('source');
         $target = $input->getArgument('target');
+        $replace = $input->getOption('replace');
+        $replaceDelimiter = $input->getOption('replaceDelimiter');
+        $replaceRule = empty($replace) ? [] : explode($replaceDelimiter, $replace);
 
         list($sourceDomain, $sourceKey) = $this->extractTextDomain($source);
         list($targetDomain, $targetKey) = $this->extractTextDomain($target);
@@ -114,14 +144,17 @@ class CopyStringCommand extends AbstractCommand
 
         // First, collect the source values from the source text domain:
         $sources = [];
-        $sourceCallback = function ($full) use ($output, $sourceKey, & $sources) {
-            $strings = $this->reader->getTextDomain($full, false);
-            if (!isset($strings[$sourceKey])) {
-                $output->writeln('Source key not found.');
-            } else {
-                $sources[basename($full)] = $strings[$sourceKey];
-            }
-        };
+        $sourceCallback
+            = function ($full) use ($output, $replaceRule, $sourceKey, & $sources) {
+                $strings = $this->reader->getTextDomain($full, false);
+                if (!isset($strings[$sourceKey])) {
+                    $output->writeln('Source key not found.');
+                    return;
+                }
+                $sources[basename($full)] = $this->applyReplaceRule(
+                    $strings[$sourceKey], $replaceRule
+                );
+            };
         $this->processDirectory($sourceDir, $sourceCallback, [$output, 'writeln']);
 
         // Make sure that all target files exist:
diff --git a/module/VuFindConsole/tests/unit-tests/src/VuFindTest/Command/Language/CopyStringCommandTest.php b/module/VuFindConsole/tests/unit-tests/src/VuFindTest/Command/Language/CopyStringCommandTest.php
index 7abec14fb09e186d8216428f0130da0c5c80a3d6..c7fab3cace62430a65fc87d1b5d3c85396cb8426 100644
--- a/module/VuFindConsole/tests/unit-tests/src/VuFindTest/Command/Language/CopyStringCommandTest.php
+++ b/module/VuFindConsole/tests/unit-tests/src/VuFindTest/Command/Language/CopyStringCommandTest.php
@@ -72,11 +72,13 @@ class CopyStringCommandTest extends \PHPUnit\Framework\TestCase
     }
 
     /**
-     * Test the simplest possible success case.
+     * Get a command mock with expectations of success.
      *
-     * @return void
+     * @param string $expectedString The expected output string of the process.
+     *
+     * @return CopyStringCommand
      */
-    public function testSuccessWithMinimalParameters()
+    protected function getSuccessfulMockCommand($expectedString = 'baz')
     {
         $expectedPath = realpath($this->languageFixtureDir) . '/foo/en.ini';
         $normalizer = $this->getMockNormalizer();
@@ -91,8 +93,19 @@ class CopyStringCommandTest extends \PHPUnit\Framework\TestCase
             ->with(
                 $this->equalTo($expectedPath),
                 $this->equalTo('xyzzy'),
-                $this->equalTo('baz')
+                $this->equalTo($expectedString)
             );
+        return $command;
+    }
+
+    /**
+     * Test the simplest possible success case.
+     *
+     * @return void
+     */
+    public function testSuccessWithMinimalParameters()
+    {
+        $command = $this->getSuccessfulMockCommand();
         $commandTester = new CommandTester($command);
         $commandTester->execute(['source' => 'foo::bar', 'target' => 'foo::xyzzy']);
         $this->assertEquals(
@@ -102,6 +115,53 @@ class CopyStringCommandTest extends \PHPUnit\Framework\TestCase
         $this->assertEquals(0, $commandTester->getStatusCode());
     }
 
+    /**
+     * Test success with the replace option set.
+     *
+     * @return void
+     */
+    public function testSuccessWithReplaceOptionAndDefaultDelimiter()
+    {
+        $command = $this->getSuccessfulMockCommand('transformed');
+        $commandTester = new CommandTester($command);
+        $commandTester->execute(
+            [
+                'source' => 'foo::bar',
+                'target' => 'foo::xyzzy',
+                '--replace' => 'baz/transformed'
+            ]
+        );
+        $this->assertEquals(
+            "Processing en.ini...\nProcessing en.ini...\n",
+            $commandTester->getDisplay()
+        );
+        $this->assertEquals(0, $commandTester->getStatusCode());
+    }
+
+    /**
+     * Test success with the replace and replaceDelimiter options set.
+     *
+     * @return void
+     */
+    public function testSuccessWithReplaceOptionAndCustomDelimiter()
+    {
+        $command = $this->getSuccessfulMockCommand('transformed');
+        $commandTester = new CommandTester($command);
+        $commandTester->execute(
+            [
+                'source' => 'foo::bar',
+                'target' => 'foo::xyzzy',
+                '--replace' => 'baz|transformed',
+                '--replaceDelimiter' => '|',
+            ]
+        );
+        $this->assertEquals(
+            "Processing en.ini...\nProcessing en.ini...\n",
+            $commandTester->getDisplay()
+        );
+        $this->assertEquals(0, $commandTester->getStatusCode());
+    }
+
     /**
      * Test failure due to missing text domain.
      *