Perl to Java Regex conversion

Question

There are some perl regular expressions that I need to convert to Java regular expressions. I'm new to Java and don't know much about Java regexes.

Regex that I want to convert are very similar to this

Text =~ /(^FOO[0-9]{4})|(^BAR[0-9]{3})/

See if string matches to either FOO4823 BAR943 (FOO and 4 numbers or BAR and 3 numbers). How would I rewrite this in Java? Are there any simple rules to convert them?

Start here: https://docs.oracle.com/javase/tutorial/essential/regex/? Come back when you will have problems with Java code. — Pshemo, May 18 '15 at 21:38
What have you tried? Did you do any research on a modern website called google? and Oracle documentation? http://docs.oracle.com/javase/7/docs/api/java/util/regex/Pattern.html — SwiftMango, May 18 '15 at 21:40
I don't know any PHP. Does `=~` grab the part that was matched by the regex? What happens if there's more than one match? — markspace, May 18 '15 at 21:46
@markspace It's perl. It just matches with the pattern and returns true or false. That is all I need to know. If the pattern matches or not. — sublime, May 18 '15 at 21:50
There are construct differences between Perl and Java, but with your regex the constructs are identical. Are you trying to do Java regex without having to learn the standard Regex function calls? This is not a good start. — , May 18 '15 at 23:10

score 1 · Answer 1 · answered May 18 '15 at 21:38

1

It would be pretty similar.

Pattern pattern = Pattern.compile("(^FOO[0-9]{4})|(^BAR[0-9]{3})");
System.out.println(pattern.matcher("FOO4823").find());
System.out.println(pattern.matcher("BAR943").find());

Take a look at the test here

answered May 18 '15 at 21:38

Nat

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score 0 · Accepted Answer · edited May 23 '17 at 12:21

0

To re-write this in Java, you want something like

String text = ...
Matcher matcher = Pattern.compile("(^FOO[0-9]{4})|(^BAR[0-9]{3})").matcher( text );
if( matcher.find() ) {  
  // ... it was found
}

As for a guide converting Perl to Java, there's a pretty good discussion in this StackOverflow question.

edited May 23 '17 at 12:21

Community

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answered May 18 '15 at 21:43

markspace

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Perl to Java Regex conversion

2 Answers2