# Libtmux.Expr.Text.is_in

- **Module:** Libtmux.Expr
- **Package:** libtmux
- **Language:** OCaml
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-ocaml/blob/205dfda49742592b479247049d186956e4a4cfe9/lib/libtmux.mli#L606
- **Public owner:** Libtmux
- **Page:** https://libtmux.org/en/ocaml/latest/reference/libtmux-expr-text-is_in/

```
val is_in : ('a, string) Field.t -> string list -> 'a t
```

Comparisons use exact bytes, without case folding or normalization. The empty substring matches every string.

## Parameters

- `arg1` (`('a, string) Field.t`)
- `arg2` (`string list`)