How about this.
? substr(string,atc('word',string)-50,100)

>I am running into trouble finding a solution to this.
>
>I want to search inside a string of text to find a word.
>Once the word is found I want to back up say 50 characters.
>Then extract about a hundred characters forward from the 50 characters back position.
>The result would be a phrase of 100 characters with the seached word in the centre.
>
>PS - This is recreational programming - Nothing urgent going on :)