- TIBCO BusinessEvents®
- Standard
- String

# String.substringBefore()

## Signature

`String substringBefore (String s1, String s2)`

## Domain

ACTION, CONDITION, QUERY

## Description

Returns the substring of the first parameter string `s1` that precedes the first occurence of the second parameter string `s2` in the first parameter sting `s1` or null if the first parameter string `s1` does not contain the second parameter string `s2`

## Parameters

Name | Type | Description
--- | --- | ---
`s1` | `String` | A String to test.
`s2` | `String` | A String to search for in String `s1`.

## Returns

Type | Description
--- | ---
`String` | The result String.

## Cautions

none