# xarray.DataArray.str.isalnum

#### DataArray.str.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

<div class="try_examples_button_container"><button class="try_examples_button" onclick="window.tryExamplesShowIframe('fd30c992-d1e3-4b54-afdd-09df10a75d0c','6e953e79-f273-49b0-a9ed-65c938417462','94e273ac-97b1-4e5e-ae10-0761232df6e6','../lite/tree/../notebooks/index.html?path=6912a590_fb8a_4050_a331_df7eeace1a9f.ipynb','None')">Try it in your browser!</button></div>
```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
```

<div id="94e273ac-97b1-4e5e-ae10-0761232df6e6" class="try_examples_outer_iframe  hidden"><div class="try_examples_button_container"><button class="try_examples_button" onclick="window.tryExamplesHideIframe('fd30c992-d1e3-4b54-afdd-09df10a75d0c','94e273ac-97b1-4e5e-ae10-0761232df6e6')">Go Back</button><button class="try_examples_button" onclick="window.openInNewTab('fd30c992-d1e3-4b54-afdd-09df10a75d0c','94e273ac-97b1-4e5e-ae10-0761232df6e6')">Open In Tab</button></div><div id="6e953e79-f273-49b0-a9ed-65c938417462" class="jupyterlite_sphinx_iframe_container"></div></div><script>document.addEventListener("DOMContentLoaded", function() {window.loadTryExamplesConfig("../try_examples.json");});</script>