Replace multiple characters in one replace call

Question

Very simple little question, but I don\'t quite understand how to do it.

I need to replace every instance of \'_\' with a space, and every instance of \'#\' with no

Answer 1

Here is a "safe HTML" function using a 'reduce' multiple replacement function (this function applies each replacement to the entire string, so dependencies among replacements are significant).

// Test:
document.write(SafeHTML('
\n\
    x
'));

function SafeHTML(str)
    {
    const replacements = [
        {'&':'&'},
        {'<':'<'},
        {'>':'>'},
        {'"':'"'},
        {"'":'''},
        {'`':'`'},
        {'\n':'
'},
        {' ':' '}
        ];
    return replaceManyStr(replacements,str);
    } // HTMLToSafeHTML

function replaceManyStr(replacements,str)
    {
    return replacements.reduce((accum,t) => accum.replace(new RegExp(Object.keys(t)[0],'g'),t[Object.keys(t)[0]]),str);
    }