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Fix StringManipulatorTool to support Unicode characters and strip emojis for SOAP compatibility (#3016)
## Problem The `StringManipulatorTool`'s default regex pattern `[^( -~)\n\r\t]+` removes all non-ASCII characters, which breaks international migrations containing accented letters, Cyrillic, Chinese characters, and other Unicode content. For example, with the current implementation: - `"Café résumé"` becomes `"Caf rsum"` - `"Привет мир"` becomes `""` (empty) - `"你好世界"` becomes `""` (empty) Additionally, emojis can cause errors when data passes through SOAP interfaces and need to be stripped while preserving other Unicode symbols. This makes the tool unsuitable for any non-English Azure DevOps migrations. ## Solution Updated the default regex pattern from `[^( -~)\n\r\t]+` to `[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F]|[\uD800-\uDBFF][\uDC00-\uDFFF]|\uFE0F` which: ✅ **Preserves Unicode content**: International characters are maintained ✅ **Strips emojis for SOAP compatibility**: Removes emoji surrogate pairs and variation selectors ✅ **Maintains security**: Still removes harmful control characters ✅ **Preserves formatting**: Keeps newlines (`\x0A`) and tabs (`\x09`) ✅ **Backward compatible**: All existing functionality preserved The new pattern specifically targets problematic content while preserving legitimate Unicode: - `\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F`: Control characters - `[\uD800-\uDBFF][\uDC00-\uDFFF]`: Emoji surrogate pairs (😀🔥💻🇺🇸) - `\uFE0F`: Variation selector for emoji presentation ## Testing - Added 27 comprehensive test cases covering Unicode and emoji scenarios - All 41 existing tests continue to pass - Verified no security vulnerabilities introduced - Demonstration of the fix: ``` Original Old Pattern New Pattern ---------------------------------------------------------------------- Héllo Wørld Hllo Wrld Héllo Wørld Привет мир Привет мир 你好世界 你好世界 Café résumé Caf rsum Café résumé Hello 😀 World Hll Wrld Hello World Math ∑ Symbol Mth Symbl Math ∑ Symbol Test\u0001Control TestControl TestControl ``` ## Documentation Updated the StringManipulatorTool documentation to: - Show examples with the new Unicode-friendly pattern - Provide specific emoji stripping examples for SOAP compatibility - Provide the legacy ASCII-only pattern for environments that require it - Clarify use cases for international migration scenarios This change enables the Azure DevOps Migration Tools to properly handle international content while maintaining SOAP compatibility and the same level of data safety and security. Fixes the issue raised in the GitHub discussion where users noted that non-ASCII character support was not available by default. Fixes #3006 <!-- START COPILOT CODING AGENT SUFFIX --> <details> <summary>Original prompt</summary> > > ---- > > *This section details on the original issue you should resolve* > > <issue_title>[Bug]: support for non-ASCII characters is not supported by default</issue_title> > <issue_description>By default "StringManipulatorTool" is enabled, but the regex pattern in AddDefaultManipulator() "[^( -~)\n\r\t]+" removes all non-ASCII characters, which is a problem for any non-english migrations. Could the pattern be updated to allow for at least unicode letters and numbers? > > Perhaps something like `[^\u0000-\uFFFF]+` would work?</issue_description> > > ## Comments on the Issue (you are @copilot in this section) > > <comments> > <comment_new><author>@MrHinsh</author><body> > Do you suggest something like `[^\u0000-\uFFFF]+` as the default?</body></comment_new> > </comments> > </details> Fixes #3006 <!-- START COPILOT CODING AGENT TIPS --> --- 💬 Share your feedback on Copilot coding agent for the chance to win a $200 gift card! Click [here](https://survey3.medallia.com/?EAHeSx-AP01bZqG0Ld9QLQ) to start the survey.
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‎docs/content/docs/reference/tools/stringmanipulatortool/index.md‎

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@@ -35,7 +35,7 @@ The tool is automatically invoked by migration processors and applies transforma
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Common scenarios where the String Manipulator Tool is essential:
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- **Data Cleanup**: Removing invalid Unicode characters, control characters, or formatting artifacts
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- **Data Cleanup**: Removing control characters or formatting artifacts while preserving Unicode content
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- **Format Standardization**: Converting text patterns to consistent formats
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- **Length Compliance**: Ensuring field values don't exceed target system limits
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- **Character Encoding**: Fixing encoding issues from legacy systems
@@ -99,12 +99,24 @@ Each manipulator supports these properties:
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### Removing Invalid Characters
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Remove non-printable characters that may cause issues in the target system:
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Remove control characters and emojis while preserving Unicode content:
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```json
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{
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"$type": "RegexStringManipulator",
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"Description": "Remove invalid characters from the end of the string",
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"Description": "Remove control characters and emojis but preserve Unicode letters and symbols",
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"Enabled": true,
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"Pattern": "[\\x00-\\x08\\x0B\\x0C\\x0E-\\x1F\\x7F-\\x9F]|[\\uD800-\\uDBFF][\\uDC00-\\uDFFF]|\\uFE0F",
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"Replacement": ""
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}
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```
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For legacy ASCII-only environments, you can use the more restrictive pattern:
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```json
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{
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"$type": "RegexStringManipulator",
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"Description": "Remove all non-ASCII characters (legacy behavior)",
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"Enabled": true,
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"Pattern": "[^( -~)\n\r\t]+",
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"Replacement": ""
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}
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```
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### Removing Emojis for SOAP Compatibility
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Remove emojis that can cause issues with SOAP interfaces while preserving other Unicode symbols:
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```json
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{
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"$type": "RegexStringManipulator",
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"Description": "Remove emojis but preserve Unicode letters and symbols",
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"Enabled": true,
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"Pattern": "[\\uD800-\\uDBFF][\\uDC00-\\uDFFF]|\\uFE0F",
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"Replacement": ""
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}
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```
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This pattern removes:
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- Emoji surrogate pairs (😀🔥💻🇺🇸)
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- Variation selectors that control emoji presentation
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- But preserves mathematical symbols (∑), arrows (→), checkmarks (✓), stars (★), and accented letters (café)
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### Fixing Encoding Issues
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Replace common encoding artifacts:

‎src/MigrationTools.Tests/ProcessorEnrichers/StringManipulatorEnricherTests.cs‎

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@@ -169,6 +169,82 @@ public void StringManipulatorTool_MultipleManipulators(string? value, string? ex
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Assert.AreEqual(expected, newValue);
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}
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[DataTestMethod(), TestCategory("L1")]
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[DataRow("Hello", "Hello")]
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[DataRow("Héllo", "Héllo")] // New behavior: accented chars preserved
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[DataRow("Привет", "Привет")] // New behavior: Cyrillic chars preserved
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[DataRow("你好", "你好")] // New behavior: Chinese chars preserved
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[DataRow("Café résumé", "Café résumé")] // New behavior: accented chars preserved
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[DataRow("Test\u0001\u0002", "Test")] // Control chars should be removed
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[DataRow("Line1\nLine2", "Line1\nLine2")] // Newlines should be preserved
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[DataRow("Tab\tSeparated", "Tab\tSeparated")] // Tabs should be preserved
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public void StringManipulatorTool_DefaultManipulator_UnicodeSupport(string value, string expected)
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{
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var options = new StringManipulatorToolOptions();
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options.Enabled = true;
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options.MaxStringLength = 1000;
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// No manipulators set - should use default
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var x = GetStringManipulatorTool(options);
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string? newValue = x.ProcessString(value);
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Assert.AreEqual(expected, newValue);
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}
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[DataTestMethod(), TestCategory("L1")]
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[DataRow("Hello", "Hello")]
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[DataRow("Héllo", "Héllo")] // Expected behavior: accented chars preserved
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[DataRow("Привет", "Привет")] // Expected behavior: Cyrillic chars preserved
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[DataRow("你好", "你好")] // Expected behavior: Chinese chars preserved
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[DataRow("Café résumé", "Café résumé")] // Expected behavior: accented chars preserved
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[DataRow("Test\u0001\u0002", "Test")] // Control chars should still be removed
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[DataRow("Line1\nLine2", "Line1\nLine2")] // Newlines should be preserved
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[DataRow("Tab\tSeparated", "Tab\tSeparated")] // Tabs should be preserved
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public void StringManipulatorTool_DefaultManipulator_ExpectedBehavior(string value, string expected)
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{
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var options = new StringManipulatorToolOptions();
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options.Enabled = true;
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options.MaxStringLength = 1000;
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// Use improved Unicode-supporting pattern
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options.Manipulators = new List<RegexStringManipulator>
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{
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new RegexStringManipulator
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{
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Enabled = true,
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Description = "Default: Removes control characters but preserves Unicode letters and symbols",
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Pattern = @"[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F]+",
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Replacement = ""
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}
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};
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var x = GetStringManipulatorTool(options);
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string? newValue = x.ProcessString(value);
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Assert.AreEqual(expected, newValue);
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}
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[DataTestMethod(), TestCategory("L1")]
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[DataRow("Hello 😀 World", "Hello World")] // Basic emoticons should be stripped (surrogate pairs)
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[DataRow("Test 🔥 Fire", "Test Fire")] // Fire emoji should be stripped (surrogate pairs)
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[DataRow("Code 💻 Work", "Code Work")] // Laptop emoji should be stripped (surrogate pairs)
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[DataRow("Heart ❤️ Love", "Heart ❤ Love")] // Variation selector stripped, heart symbol preserved
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[DataRow("Flag 🇺🇸 Country", "Flag Country")] // Regional indicators stripped (surrogate pairs)
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[DataRow("Math ∑ Symbol", "Math ∑ Symbol")] // Mathematical symbols preserved (not surrogate pairs)
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[DataRow("Arrow → Direction", "Arrow → Direction")] // Arrows preserved (not surrogate pairs)
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[DataRow("Check ✓ Mark", "Check ✓ Mark")] // Useful dingbats preserved (not surrogate pairs)
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[DataRow("Star ★ Rating", "Star ★ Rating")] // Miscellaneous symbols preserved (not surrogate pairs)
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[DataRow("Café résumé", "Café résumé")] // Regular Unicode letters preserved
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[DataRow("Test\u0001\u0002", "Test")] // Control chars should be removed
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public void StringManipulatorTool_DefaultManipulator_EmojiStripping(string value, string expected)
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{
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var options = new StringManipulatorToolOptions();
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options.Enabled = true;
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options.MaxStringLength = 1000;
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// No manipulators set - should use default (which should strip emojis)
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var x = GetStringManipulatorTool(options);
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string? newValue = x.ProcessString(value);
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Assert.AreEqual(expected, newValue);
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}
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private static StringManipulatorTool GetStringManipulatorTool(StringManipulatorToolOptions options)
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{
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var services = new ServiceCollection();

‎src/MigrationTools/Tools/StringManipulatorTool.cs‎

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Options.Manipulators.Add(new RegexStringManipulator()
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{
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Enabled = true,
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Description = "Default: Removes invalid chars!",
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Pattern = "[^( -~)\n\r\t]+",
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Description = "Default: Removes control characters and emojis but preserves Unicode letters and symbols",
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Pattern = @"[\x00-\x08\x0B\x0C\x0E-\x1F\x7F-\x9F]|[\uD800-\uDBFF][\uDC00-\uDFFF]|\uFE0F",
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Replacement = ""
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});
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}

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