how to loop in general and then apply .getelementsbyID

Hello,

I have the following HTML code:

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The html page displays 40 requirements, so each one's ID is named requirement0, requirement1, requirement2, etc, until requirement39. I need to check if certain text is occuring inside these. How do I loop this so that it adds one each time to the getelementbyid tag, checking the inner text for a parameter, lets say DOCIMG like above?

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Artik