有java正则表达式的麻烦

Question

I'm new to regex in Java and am having trouble getting it to work properly. The following code is saying there were no matches found.

pattern = Pattern.compile("EN\\( [ -][0-5]\\)= \\d+.?\\d*E[+-]\\d{2}");
match = pattern.matcher("EN(  0)= 0.000000E+00");
String result = match.group();

As far as I can tell, this should be working. I've been using the Oracle java tutorial on regular expressions to guide me. Any and all help is appreciated.

Answer 1

Almost there, you just need:

Matcher match = pattern.matcher("EN(  0)= 0.000000E+00");
match.find(); // <-- missing
String result = match.group();

Answer 2

- in [ -] is special character so you must use [ \\\\-]

Pattern pattern = Pattern.compile("EN\\( [ \\-][0-5]\\)= \\d+.?\\d*E[+\\-]\\d{2}");
Matcher match = pattern.matcher("EN(  0)= 0.000000E+00");
if (match.find())
    System.out.println(match.group());