# xarray.core.accessor_str.StringAccessor.isalnum

#### StringAccessor.isalnum()[[source]](https://github.com/pydata/xarray/blob/main/xarray/core/accessor_str.py#L865-L887)

Check whether all characters in each string are alphanumeric.

* **Returns:**
  **isalnum** ([array](https://numpy.org/doc/stable/glossary.html#term-array) of [`bool`](https://docs.python.org/3/builtins/functions.html#bool)) – Array of boolean values with the same shape as the original array.

### Examples

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```pycon
>>> da = xr.DataArray(["H2O", "NaCl-"], dims="x")
>>> da
<xarray.DataArray (x: 2)> Size: 40B
array(['H2O', 'NaCl-'], dtype='<U5')
Dimensions without coordinates: x
>>> isalnum = da.str.isalnum()
>>> isalnum
<xarray.DataArray (x: 2)> Size: 2B
array([ True, False])
Dimensions without coordinates: x
```

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