Trim a character from both ends

Remove a repeated character from the start and the end only.

JavaScript Version 1.0.0 · MIT · .md

function trimCharacter({ text, char }) { const escaped = char.replace(/[.*+?^${}()|[\]\\]/g, '\\$&'); return text.replace(new RegExp(`^(?:${escaped})+|(?:${escaped})+$`, 'g'), ''); }

Input & expected output

{
  "text": "--ana--",
  "char": "-"
}

"ana"

The edge case

{
  "text": "a-b",
  "char": "-"
}

"a-b"

Know the limits

• The original split on the character and joined with commas, which also removed inner characters; this version trims the ends only.

The function above is the implementation used by the lab. The lab validates JSON types and caps size before execution; include equivalent validation when accepting untrusted input in your application.

Keep exploring

• Capitalize a string — Uppercase the first Unicode code point and preserve the remaining text.
• Reverse a string — Reverse Unicode code points without splitting surrogate pairs.
• Check a palindrome — Compare a string with its code-point reversal.