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String Escape / Unescape

Escape and unescape text for JSON, XML, CSV, regex, or POSIX shell contexts

Context:
hello & "world" <tag>123</tag>
new line
hello & "world" <tag>123</tag>
new line

Both directions update live from the same input. Useful for safely embedding text inside JSON payloads, XML/HTML attributes, CSV columns, regex literals, or shell commands.