# Trim a character from both ends

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

Canonical: https://1loc.dev/string/trim-some-character/
Version: 1.0.0
Runtime: JavaScript · Node.js 22 / modern browsers
Verification: Local fixtures; no external services
Updated: 2026-10-28

## Implementation

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

## Input

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

## Expected output

```json
"ana"
```

## Edge case

Input:
```json
{
  "text": "a-b",
  "char": "-"
}
```
Output:
```json
"a-b"
```

## Limits

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

The lab validates types and size before calling this function. Add equivalent validation at your own trust boundary.

## Source and license

Original: https://github.com/phuocng/1loc/blob/14b481cf60dff1620ab1bb99a43b1f68068cdd9b/contents/trim-some-character.mdx
Author: Nguyen Huu Phuoc and original contributors
Contributors: mahdiyar
Source commit: 14b481cf60dff1620ab1bb99a43b1f68068cdd9b
Copyright (c) 2020 phuoc-ng
License: MIT — https://1loc.dev/licenses/
Maintainer: Oveyon
Modifications: Rewritten to trim only the ends; the original removed inner occurrences and joined with commas. Original MDX retained as inert source evidence.