How to parse digits from a multiline string? : <p>What's the recommended approach to parse the digits from the following multiline string in C#?</p>

<pre><code>---   ---    |  |   |   -----
 /     _|    |  |___|   |___
 \    |      |      |       |
--    ---    |      |   ____|
|  |   |   -----
|  |___|   |___
|      |       |
|      |   ____|
</code></pre>
