java - Using a regex to match a word ending in a comma but not within another word -


i want use regex achieve 2 objectives: match string when complete word (don't match "on" inside of "contact"), , match strings end comma or period.

this example. meant find string (str2) in str , replace same string surrounded parenthesis.

while(scan2.hasnext()) {     string str2 = scan2.next();     str = str.replaceall("\\b" + str2 + "\\b", "(" + str2 + ")"); }

it avoid matching strings within words, ignores strings end in comma or period.

how this?

public class main {     public static void main(string[] args) {         system.out.println(replace("upon contact", "on"));         system.out.println(replace("upon contact,", "contact"));         system.out.println(replace("upon contact", "contact"));     }      private static string replace(string s1, string s2) {         return s1.replaceall(string.format("\\b(%s)\\b(?=[.,])", s2), "\\($1\\)");     } }

upon contact // matches complete words

upon (contact), // replaces match (match)

upon contact // matches if ends , or .


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