CODEWITHSUNDEEP
javaregex
Dominik
Dominik

Reputation: 4768

Extracting a String

I have a string that is always built likeMfr Part#: MBRB1045G Technologie ... or Mfr Part#: MBRB1545CTT4G Mounting, so there is always Mfr Part#: then the partnumber I want to extract and then this is followed by either Technologie or Mounting entailed by other characters.

How would you extract that partnumber MBRB1045G from this?

Upvotes: 0

Views: 79

Answers (4)

rolve
rolve

Reputation: 10218

This should do the trick:

    final Pattern pattern = Pattern
            .compile("Mfr Part#: ([^ ]+) (Technologie|Mounting).*");
    final Matcher matcher = pattern
            .matcher("Mfr Part#: MBRB1045G Mounting");
    matcher.matches();
    System.out.println(matcher.group(1));

However, if it's not important to you to check that the string has that specific pattern, you might also use the simpler expression: Mfr Part#: ([^ ]+) .*

Also note that you may store the pattern object and reuse it for subsequent usages. This will give you a better performance.

Upvotes: 3

Guillaume Polet
Guillaume Polet

Reputation: 47608

I see two ways to do that (and there are likely others): regexp and groups, or indexOf and substring

1) Regexp and groups

String input = "Mfr Part#: MBRB1045G Technologie";
Pattern p = Patter.compile("Mfr Part#: ([A-Z0-9]+) (Technologie|Mounting)");
Matcher m = p.matcher(input);
while(m.find()) {
    System.err.println("Part number: "+m.group(1)+ "Second part is "+m.group(2);
}

2) indexOf and substring

String prefix = "Mfr Part#: ";
String input = "Mfr Part#: MBRB1045G Technologie";
for (int i=  0;i<input.length();i++) {
    int index1 = input.indexOf(prefix);
    int index2 = index1+prefix.length();
    int index3 = input.indexOf(" ", );
    int index4 = input.indexOf(" ", index3+1);
    System.err.println("Part number: "+input.substring(index2, index3)
          + "Second part is "+input.substring(index3, index4);
    index = index4;

}

Caveats: I have not run it so you may have to fix typos.

Upvotes: 0

Matt
Matt

Reputation: 11805

Probably a regular expression with grouping would be best. (google for perlre)

String input = "Mfr Part#: MBRB1045G Technologie";
String regexpression = "Mfr Part#: (\\w+) (\\w+)";
Pattern p = Pattern.compile(regexpression);
Matcher m = p.matcher(input);
if (m.matches()) {
    String part = m.group(1);
    String desc = m.group(2);

    System.out.println(part);
    System.out.println(desc);
}

Upvotes: 0

tgr
tgr

Reputation: 3608

I would probably use java.util.Scanner. It might not be the optimal way to do so but in my oppinion the most comfortable.
It would work this way:

import java.util.Scaner;

String s = "Mfr Part#: MBRB1045G Technologie RZ137GA";
Scanner scn = new Scanner(s);
scn.next();
scn.next();
String partnumber = scn.next();
scn.next();
String technologie = scn.next();
scn.close();

The variable partnumber would contain MBRB1045G and technologie contains RZ137GA.

Upvotes: 0

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