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✅ luka-mimi
❌ luka

name = name.replace(
  /[^a-zA-Z0-9\u4e00-\u9fa5\uAC00-\uD7A3\u3040-\u30FF\u0E00-\u0E7F\u0600-\u06FF\u0370-\u03FF\u0400-\u04FF\u0100-\u017F._-]/g,
  '_'
).replace(/^\.+/, '_');

🔹 First .replace(...)

/[^a-zA-Z0-9\u4e00-\u9fa5\uAC00-\uD7A3\u3040-\u30FF\u0E00-\u0E7F\u0600-\u06FF\u0370-\u03FF\u0400-\u04FF\u0100-\u017F._-]/g

This regular expression matches any character that is NOT in the allowed set. Here's what it allows:

✅ Allowed Characters:

• a-zA-Z0-9: All English letters (upper and lower case) and digits
• \u4e00-\u9fa5: Simplified Chinese characters
• \uAC00-\uD7A3: Korean Hangul syllables
• \u3040-\u30FF: Japanese Hiragana and Katakana
• \u0E00-\u0E7F: Thai characters
• \u0600-\u06FF: Arabic characters
• \u0370-\u03FF: Greek characters
• \u0400-\u04FF: Cyrillic characters (e.g., Russian, Ukrainian)
• \u0100-\u017F: Latin Extended-A (e.g., letters with accents like Ā, Č, etc.)
• .: a dot (period) — allowed
• _: an underscore — allowed
• -: a hyphen — allowed

⚠️ Replaced:

Anything outside of these ranges is replaced with an underscore (_).

🔹 Second .replace(...)

/^\.+/

This matches one or more dots at the start of the string (i.e., leading dots). It's used to sanitize filenames that start with . (e.g., .env or .hidden files).

• ^: beginning of the string
• \.+: one or more literal dots

⚠️ Replaced:

Any leading dots are replaced with a single underscore _, to avoid hidden/system file behavior on UNIX-like systems.

🔚 Summary

This code:

1. Replaces all invalid characters (not in approved multilingual ranges + safe symbols) with _.
2. Replaces leading dots with _ to prevent system file behavior.

Used mainly for filename sanitization across different languages and OSes.

Hey @luka-mimi,

Thanks for the PR, We have created "GHC-2404" as the internal reference to get this reviewed.

One of us will be in touch if there are any changes needed, in most cases this is normally within a couple of weeks but it depends on the current workload of the team.