Question

I have a string named s_Result which will be parsed from the Internet. The format may be "Distance: 2.8km (about 9 mins)", and there are 4 variables which are f_Distance, m_DistanceUnit, f_timeEst, m_timeEstUnit.

My question is how to parse s_Result and assign 2.8, km, 9, mins into f_Distance, m_distanceUnit, f_timeEst and m_timeEstUnit respectively using regular expression?

I tried using "\d+(\.\d+)?" in RegEx Tester and the result showed 2 matches found, but if I use "\\d+(\\.\\d+)?" in Android code, it showed no matches!

Any suggestions what might be going wrong?

Answer 1

Something like that?

String s_Result="Distance: 2.8km (about 9 mins)";

//Distance parsing
Pattern p = Pattern.compile("Distance: (\\d+(\\.\\d+)?)(.*?)\\b");
Matcher m = p.matcher(s_Result);
if(m.find()){
    MatchResult mr=m.toMatchResult();
    f_Distance=mr.group(1);//2.8
    m_DistanceUnit=mr.group(3);//km
}

//Time parsing
p = Pattern.compile("about (\\d+(\\.\\d+)?) (.*)\\b");
m = p.matcher(s_Result);
if(m.find()){
    MatchResult mr=m.toMatchResult();
    f_timeEst=mr.group(1);//9
    m_timeEstUnit=mr.group(3);//min
}

And here’s another option for you, to match more flexible format:

String s_Result="Distance: 2.8km (about 9 mins)";
Pattern p = Pattern.compile("(\\d+(\\.\\d+)?) ?(\\w+?)\\b");
Matcher m = p.matcher(s_Result);
while(m.find()){
    MatchResult mr=m.toMatchResult();
    String value=mr.group(1);//2.8 and 9 come here
    String units=mr.group(3);//km and mins come here
}