---
name: hex
status: documented
runtime: pp
source: src/runtime/pp/strings/convert.rs
---
```{index} single: hex; Perl built-in (pp runtime)
```

# hex

## Synopsis

```perl
$val = hex("ff");       # 255
$val = hex("0xDEAD");   # 57005
$val = hex("ff_ff");    # 65535
```

## Description

Interprets a hexadecimal string as an integer.

Accepts an optional `0x` or `0X` prefix. Underscores are allowed as
digit separators. Leading and trailing whitespace is stripped.
Returns 0 for empty or non-hex input.

## See also

oct