# LibTmux.Query.contains

- **Package:** libtmux-haskell
- **Language:** Haskell
- **Kind:** function
- **Source:** https://github.com/libtmux/libtmux-haskell/blob/663e212622a02aa74a9bdc8ff71e2b45fcb1d4d5/internal/LibTmux/Internal/Query.hs#L161
- **Page:** https://libtmux.org/en/haskell/latest/reference/libtmux-query-v-contains/

```haskell
contains :: Field row Text -> Text -> Expr row
```

Signature types: [`Field`](/en/haskell/latest/reference/libtmux-query-t-field/), [`Text`](https://hackage.haskell.org/package/text-2.1.3/docs/Data-Text.html#t:Text), [`Expr`](/en/haskell/latest/reference/libtmux-query-t-expr/).

Exact, case-sensitive Text substring matching. Byte-bearing fields are
 deliberately excluded; use typed equality for their retained values.

## Referenced declarations

- [`LibTmux.Query.Expr`](/en/haskell/latest/reference/libtmux-query-t-expr/) (data type)
- [`LibTmux.Query.Field`](/en/haskell/latest/reference/libtmux-query-t-field/) (data type)