Having trouble with java regex

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.

How is the code saying no matches were found? Show the unexpected behavior or output. — Jonathon Faust
– Jonathon Faust, Commented Jun 29, 2012 at 23:41
I get a No Match Found error, being thrown by match.group(). — MattS
– MattS, Commented Jun 29, 2012 at 23:42

Francisco Spaeth · Accepted Answer · 2012-06-29 23:42:26Z

2

Almost there, you just need:

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

answered Jun 29, 2012 at 23:42

Francisco Spaeth

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Pshemo · Accepted Answer · 2012-06-29 23:42:36Z

1

- 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());

answered Jun 29, 2012 at 23:42

Pshemo

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