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

# function::strpos(3stap)

Returns location of a substring within another string

## NAME

function::strpos - Returns location of a substring within another string

## SYNOPSIS

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

## ARGUMENTS

*s1*

string to search in

*s2*

substring to find

## DESCRIPTION

This function returns location of the first occurence of string *s2* within *s1*, namely the return value is 0 in case *s2* is a prefix of *s1*. If *s2* is not a substring of *s1*, then the return value is -1.

## SEE ALSO0

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