---
name: "function::isinstr"
section: "3stap"
platform: "linux"
package: "systemtap-doc"
version: "5.1-5"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/function::isinstr"
---

# function::isinstr(3stap)

Returns whether a string is a substring of another string

## NAME

function::isinstr - Returns whether a string is a substring of another string

## SYNOPSIS

```
    isinstr:long(s1:string,s2:string)
```

## ARGUMENTS

*s1*

string to search in

*s2*

substring to find

## DESCRIPTION

This function returns 1 if string *s1* contains *s2*, otherwise zero.

## SEE ALSO0

[*tapset::string*(3stap)](/tapset::string/3stap.md)