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substringBefore

substringBefore(text: String, separator: String): String

Gets the substring before the first occurrence of a separator. The separator is not returned.

Introduced in DataWeave version 2.2.0.

Parameters

Name Description

text

The input string.

separator

String to search for.

Example

This example shows how substringBefore behaves with different inputs and sizes.

Source

%dw 2.0
import * from dw::core::Strings
output application/json
---
{
  "a": substringBefore(null, "'"),
  "b": substringBefore("", "-"),
  "c": substringBefore("abc", "b"),
  "d": substringBefore("abc", "c"),
  "e": substringBefore("abc", "d"),
  "f": substringBefore("abc", "")
}

Output

{
  "a": null,
  "b": "",
  "c": "a",
  "d": "ab",
  "e": "",
  "f": ""
}

substringBefore(text: Null, separator: String): Null

Helper function that enables substringBefore to work with a null value.

Introduced in DataWeave version 2.2.0.