Conversion from json to decimal

I have a JSON string.

{开发者_JS百科"bounds": {"south west":{ "lng":74.1475868, "lat": 31.366689}, "northeast": { "lng":74.85623 ,"lat": 32.5698746}}

I want to get integers with decimal values using regular expression in Java.

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JSON is not a regular language, and can therefore not be parsed by plain regular expressions (and parsing it with non-regular extensions of regular expressions is extremely complicated). Instead, use a Java JSON library.

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Don't use regex to parse structured documents. There are way better ways to do it. Now in case someone forced you to use regex to do this job by pointing a gun in your head you could use this :

try {
    Pattern regex = Pattern.compile("[-+]?\\b[0-9]*\\.?[0-9]+\\b");
    Matcher regexMatcher = regex.matcher(subjectString);
    while (regexMatcher.find()) {
        // matched text: regexMatcher.group()
        // match start: regexMatcher.start()
        // match end: regexMatcher.end()
    } 
} catch (PatternSyntaxException ex) {
    // Syntax error in the regular expression
}

This will catch all numbers integer or not negative or positive with optional integer part.

Note it will not match numbers with scientific notation!