public function startOfLine()
    {
        if (false === strpos($this->prefixes, '^')) {
            $this->prefixes = '^' . $this->prefixes;
        }

        return $this;
    }
public function startOfLine()
    {
        if (false === strpos($this->prefixes, '^')) {
            $this->prefixes = '^' . $this->prefixes;
        }

        return $this;
    }
public function startOfLine ( ) { if ( false === strpos ( $ this -> prefixes , '^' ) ) { $ this -> prefixes = '^' . $ this -> prefixes ; } return $ this ; }
Add start of line prefix

@return $this
Add start of line prefix