Regex to match words in a sentence by its prefix

Question

I have this regex on mongodb query to match words by prefix:

{sentence: new RegExp(\'^\'+key,\'gi\')}

What would be the right regex pattern

Answer 1

You can use the expression /\bprefix\w+/. This should match any word starting with "prefix". Here the \b represents a word boundary and \w is any word character.

If you don't want to get the whole word, you can just do /\bprefix/. If you want to put this in a string, you also have to escape the \: '\\bprefix'.