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Why Identical-Looking Lines Do Not Match

Diagnose a zero-width space or non-breaking space before comparing identifiers.

Try the workflow

Copy the example lines into the detector. The first contains a non-breaking space; the second contains a zero-width space. Choose Preview repairs, then review before copying. Open the tool.

Copy the example

ID 00123
item​name
ID 00123
itemname

Check the result

The report shows U+00A0 at line 1, column 3 and U+200B at line 2, column 5. Use file import to inspect the original BOM or CRLF. The preview leaves joiners intact.