TrimPrefix

Overview

The TrimPrefix converter removes a specified prefix from the beginning of a string. If the string does not start with the prefix, it is returned unchanged.

Syntax

TrimPrefix(target, prefix)

• target: the string to trim
• prefix: the prefix string to remove

Examples

Input

{
	"_type": "log",
	"body": {
		"url": "https://api.example.com/v2/users",
		"path": "report_2026_final.csv"
	},
	"resource": {...},
	"attributes": {}
}

Statement

set(attributes["trimmed_url"], TrimPrefix(body["url"], "https://"))
set(attributes["no_match"], TrimPrefix(body["url"], "ftp://"))

Output

{
	"_type": "log",
	"body": {
		"url": "https://api.example.com/v2/users",
		"path": "report_2026_final.csv"
	},
	"resource": {...},
	"attributes": {
		"trimmed_url": "api.example.com/v2/users",
		"no_match": "https://api.example.com/v2/users"
	}
}

The https:// prefix was removed from the URL. When the prefix does not match (ftp://), the original string is returned unchanged.