PLT-6271 Changed word splitting to initially split on any non-name character (#6261)

* PLT-6271 Changed word splitting to initially split on any non-name character

* Fixed detection of out of channel mentions

app/notification_test.go

@@ -168,40 +168,38 @@ func TestGetExplicitMentionsAtHere(t *testing.T) {
 		"here":      false,
 		"@here":     true,
 		" @here ":   true,
-		"\t@here\t": true,
 		"\n@here\n": true,
-		// "!@here!": true,
-		// "@@here@": true,
-		// "#@here#": true,
-		// "$@here$": true,
-		// "%@here%": true,
-		// "^@here^": true,
-		// "&@here&": true,
-		// "*@here*": true,
-		"(@here(": true,
-		")@here)": true,
-		// "-@here-": true,
-		// "_@here_": true,
-		// "=@here=": true,
+		"!@here!":   true,
+		"#@here#":   true,
+		"$@here$":   true,
+		"%@here%":   true,
+		"^@here^":   true,
+		"&@here&":   true,
+		"*@here*":   true,
+		"(@here(":   true,
+		")@here)":   true,
+		"-@here-":   true,
+		"_@here_":   false, // This case shouldn't mention since it would be mentioning "@here_"
+		"=@here=":   true,
 		"+@here+":   true,
 		"[@here[":   true,
 		"{@here{":   true,
 		"]@here]":   true,
 		"}@here}":   true,
 		"\\@here\\": true,
-		// "|@here|": true,
-		";@here;": true,
-		":@here:": true,
-		// "'@here'": true,
-		// "\"@here\"": true,
-		",@here,": true,
-		"<@here<": true,
-		".@here.": true,
-		">@here>": true,
-		"/@here/": true,
-		"?@here?": true,
-		// "`@here`": true,
-		// "~@here~": true,
+		"|@here|":   true,
+		";@here;":   true,
+		":@here:":   true,
+		"'@here'":   true,
+		"\"@here\"": true,
+		",@here,":   true,
+		"<@here<":   true,
+		".@here.":   true,
+		">@here>":   true,
+		"/@here/":   true,
+		"?@here?":   true,
+		"`@here`":   false, // This case shouldn't mention since it's a code block
+		"~@here~":   true,
 	}
 
 	for message, shouldMention := range cases {