I have a list of String containing values like this:
String [] arr = {"${US.IDX_CA}", "${UK.IDX_IO}", "${NZ.IDX_BO}", "${JP.IDX_TK}", "${US.IDX_MT}", "more-elements-with-completely-different-patterns-which-is-irrelevant"};
I'm trying to extract all the IDX_XX from this list. So from above list, i should have, IDX_CA, IDX_IO, IDX_BO etc using regex in Java
I wrote following code:
Pattern pattern = Pattern.compile("(.*)IDX_(\\w{2})");
for (String s : arr){
Matcher m = pattern.matcher(s);
if (m.matches()){
String extract = m.group(1);
System.out.println(extract);
}
}
But this does not print anything. Can someone please tell me what mistake am i making. Thanks.
Use the following fix:
String [] arr = {"${US.IDX_CA}", "${UK.IDX_IO}", "${NZ.IDX_BO}", "${JP.IDX_TK}", "${US.IDX_MT}", "more-elements-with-completely-different-patterns-which-is-irrelevant"};
Pattern pattern = Pattern.compile("\\bIDX_(\\w{2})\\b");
for (String s : arr){
Matcher m = pattern.matcher(s);
while (m.find()){
System.out.println(m.group(0)); // Get the whole match
System.out.println(m.group(1)); // Get the 2 chars after IDX_
}
}
See the Java demo , output:
IDX_CA
CA
IDX_IO
IO
IDX_BO
BO
IDX_TK
TK
IDX_MT
MT
NOTES :
\\bIDX_(\\w{2})\\b
pattern that matches IDX_
and 2 word chars in between word boundaries and captures the 2 chars after IDX_
into Group 1 m.matches
needs a full string match, so it is replaced with m.find()
if
replaced with while
in case there are more than 1 match in a string m.group(0)
contains the whole match values m.group(1)
contains the Group 1 values.
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