As input parameters I can have two types of String:
codeName=SomeCodeName&codeValue=SomeCodeValue
or
codeName=SomeCodeName
without codeValue
.
codeName
and codeValue
are the keys.
How can I use regular expression to return the key's values? In this example it would return only SomeCodeName
and SomeCodeValue
.
I wouldn't bother with a regex for that. String.split with simple tokens ('&', '=') will do the job.
String[] args = inputParams.split("&");
for (String arg: args) {
String[] split = arg.split("=");
String name = split[0];
String value = split[1];
}
Consider using Guava's Splitter
String myinput = "...";
Map<String, String> mappedValues =
Splitter.on("&")
.withKeyValueSeparator("=")
.split(myinput);
The simple way is to split the source string first and then to run 2 separate regular expressions against 2 parts.
Pattern pCodeName = Pattern.compile("codeName=(.*)");
Pattern pCodeValue = Pattern.compile("codeValue=(.*)");
String[] parts = str.split("\\&");
Matcher m = pCodeName.matcher(parts[0]);
String codeName = m.find() ? m.group(1) : null;
String codeValue = null;
if (parts.length > 1) {
m = pCodeValue.matcher(parts[1]);
codeValue = m.find() ? m.group(1) : null;
}
}
But if you want you can also say:
Pattern p = Pattern.compile("codeName=(\\w+)(\\&codeValue=(\\w+))?");
Matcher m = p.matcher(str);
String codeName = null;
String codeValue = null;
if (m.find()) {
codeName = m.group(1);
codeValue = m.groupCount() > 1 ? m.group(2) : null;
}
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