Regular Expression to MATCH ALL words in a query, in any order

Question

I\'m trying to build a search feature for a project which narrows down items based on a user search input and if it matches the keywords listed against items. For this, I\'m

Answer 1

Based on the accepted answer I wrote a simple Java method that builds the regex from an array of keywords

public static String regexIfAllKeywordsExists(String[] keywords) {
    StringBuilder sb = new StringBuilder("^");

    for (String keyword : keywords) {
        sb.append("(?=.*\\b");
        sb.append(keyword);
        sb.append("\\b)");
    }

    sb.append(".+");

    return sb.toString();
}