A question about regular expressions

Problem: There is a string: "Python php ruby JavaScript jsonp perhapsphpisoutdated"
For this string, use pure to get all words with P but not ph

Output array [' Python ', ' javascript ', ' Jsonp ']

This question has been thought for a long time and has no idea.
My solution is to

var result = str.match(/\b\w*(?=p)\w*\b/g)                .filter((value)=>!/.*(?=ph)/.test(value))var result2 = str.match(  /\b((?!ph|\s).)*((p[^h\s]((?!ph|\s).)*)|p)\b/g  ) console.log(result2)

But it doesn't meet the requirements of pure.

There are Daniel in the group who gave such an answer.

Perfect operation

But I don't understand, I hope Daniel can help me interpret

