Moved flag-checking after flag.Parse()

main.go

@@ -15,6 +15,8 @@ import (
 
 const CONCAT rune = '~'
 
+var notDotChars []rune
+
 func isOperator(c rune) bool {
 	if c == '+' || c == '?' || c == '*' || c == '|' || c == CONCAT {
 		return true
@@ -388,11 +390,17 @@ func main() {
 	// 1. Without '-v': Prints only matches. Prints a newline after every match.
 	// 2. With '-v': Substitutes all matches with empty string.
 	onlyFlag := flag.Bool("o", false, "Print only colored content. Overrides -l.")
-	lineFlag := flag.Bool("l", false, "Only print lines with a match (or with no matches, if -v is enabled (similar to grep's default")
-	multiLineFLag := flag.Bool("t", false, "Multi-line mode. Treats newline just like any character.")
+	lineFlag := flag.Bool("l", false, "Only print lines with a match (or with no matches, if -v is enabled). Similar to grep's default.")
+	multiLineFlag := flag.Bool("t", false, "Multi-line mode. Treats newline just like any character.")
 	printMatchesFlag := flag.Bool("p", false, "Prints start and end index of each match. Can only be used with '-t' for multi-line mode.")
 	flag.Parse()
 
+	// In multi-line mode, 'dot' metacharacter also matches newline
+	if !(*multiLineFlag) {
+		notDotChars = []rune{'\n'}
+	} else {
+		notDotChars = []rune{}
+	}
 	// -l and -o are mutually exclusive: -o overrides -l
 	if *onlyFlag {
 		*lineFlag = false
@@ -424,7 +432,7 @@ func main() {
 		if linesRead {
 			break
 		}
-		if !(*multiLineFLag) {
+		if !(*multiLineFlag) {
 			// Read every string from stdin until we encounter an error. If the error isn't EOF, panic.
 			test_str, err = reader.ReadString('\n')
 			if err != nil {