regular expression how to get substring?

Question

This are my example data:

406/FG-2000

411/FA-2120

XX-226/2012-DFDF

OASDV-279/1016-FDFFD

how can with regex (only regex) in java i parse

406/FG-2000 -> 406 (from begining to /)

411/FA-2120 -> 411 (from begining to /)

XX-226/2012-DFDF -> 226 (from - to /)

OASDV-279/1016-FDFFD -> 279 (from - to /)

this are two rules. (from begining to /) or (from - to /)

According to your testdata: is a third rule "must be digits"? — Boosty
– Boosty, Commented Apr 11, 2012 at 6:40

Bohemian · Accepted Answer · 2012-04-11 06:43:39Z

4

This code does what you asked for:

input.replaceAll(".*(^|-)(.*?)/.*", "$2")

If you want to restrict it to digits only, change the matching regex to ".*(^|-)(\\d*?)/.*"

Here's a test:

public static void main(String[] args) {
    String[] inputs = { "406/FG-2000", "411/FA-2120", "XX-226/2012-DFDF", "OASDV-279/1016-FDFFD" };
    for (String input : inputs)
        System.out.println(input.replaceAll(".*(^|-)(.*?)/.*", "$2"));
}

Output:

answered Apr 11, 2012 at 6:43

Bohemian♦

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2 Comments

senzacionale Over a year ago

i tested here: roblocher.com/technotes/regexp.aspx but i get group 1 and group 2 as result. Why not just 1 result?

Bohemian Over a year ago

groups are bracketed expressions. there are two groups in the regex, but the first one is there only because of the "OR" expression. the second group is the "real" capturing group

Gertjan Assies · Accepted Answer · 2012-04-11 06:47:30Z

0

Try this one:

(^|-)[0-9]+/

It will match any numbers from the beginning or from a - to the /

answered Apr 11, 2012 at 6:47

Gertjan Assies

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