Search string for numbers

I have a javascript chat bot where a person can enter any question they like in the input field and hope to get an exact answer. I can do this, but I know that all this is wrong, because I do not know in what position the number will appear in the sentence. If a person enters exactly:

which square root of 5 works fine.

If he is type in such things, it is not.

what is the square root of 5

the square root of 5 is that

Did you know that the square root of 5

etc.

I need to determine where the number appears in the sentence, and then perform the calculation from there. Please note that the line below is part of a larger working chat. In the line below, I'm just trying to answer any question with a square root no matter where the number appears in the sentence. I also know that there are many pitfalls with an open input field, where a person can enter anything, for example, spelling errors, etc. This is just for fun, not a serious scientific project. :)

if(
    (word[0]=="what's") &&
    (word[1]=="the") &&
    (word[2]=="square") &&
    (word[3]=="root") &&
    (word [4]=="of") &&
    (input.search(/\d{1,10}/)!=-1) &&
    (num_of_words==6)
){        
    var root= word[5];
    if(root<0){ 
        document.result.result.value = "The square root of a negative number is not possible.";
    }else{
         word[5] = Math.sqrt(root);
         word[5] = Math.round(word[5]*100)/100 
         document.result.result.value = "The square root of "+ root +" is "+ word[5] +"."; 
    }
    return true;
}

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