In PHP if we need to match a something like, ["one","two","three"], we could use the following regular expression with preg_match.
$pattern = "/\[\"(\w+)\",\"(\w+)\",\"(\w+)\"\]/"
By using the parenthesis we are also able to extract the words one, two and three. I am aware of the Matcher object in Java, but am unable to get similar functionality; I am only able to extract the entire string. How would I go about mimicking the preg_match behaviour in Java.
With a Matcher, to get the groups you have to use the Matcher.group() method.
For example :
Pattern p = Pattern.compile("\[\"(\w+)\",\"(\w+)\",\"(\w+)\"\]");
Matcher m = p.matcher("[\"one\",\"two\",\"three\"]");
boolean b = m.matches();
System.out.println(m.group(1)); //prints one
Remember group(0) is the same whole matching sequence.
Resources :
Answer：
Java Pcre is a project that provides a Java implementation of all the php pcre funcions. You can get some ideas from there. Check the project https://github.com/raimonbosch/java.pcre
Answer：
I know this post came from 2010, buat the fact that I just searched for it, may be someone else would still need it too. So here is the function I created for my need.
basically, it will replace all keywords with the value from a json (or model, or any data source)
how to use:
JsonObject jsonROw = some_json_object;
String words = "this is an example. please replace these keywords [id], [name], [address] from database";
String newWords = preg_match_all_in_bracket(words, jsonRow);
I use this codes in my shared adapter.
public static String preg_match_all_in_bracket(String logos, JSONObject row) {
String startString="\[", endString="\]";
return preg_match_all_in_bracket(logos, row, startString, endString);
}
public static String preg_match_all_in_bracket(String logos, JSONObject row, String startString, String endString) {
String newLogos = logos, withBracket, noBracket, newValue="";
try {
Pattern p = Pattern.compile(startString + "(\w*)" + endString);
Matcher m = p.matcher(logos);
while(m.find()) {
if(m.groupCount() == 1) {
noBracket = m.group(1);
if(row.has(noBracket)) {
newValue = ifEmptyOrNullDefault(row.getString(noBracket), "");
}
if(isEmptyOrNull(newValue)) {
//no need to replace
} else {
withBracket = startString + noBracket + endString;
newLogos = newLogos.replaceAll(withBracket, newValue);
}
}
}
} catch (JSONException e) {
e.printStackTrace();
}
return newLogos;
}
I am also new to Java/Android, please feel free to correct if you think this is a bad implementation or something. tks
