java - How to make a subString from another string by searching for certain characters -

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string x = "id:12 patient name:...";     string z = = x.substring(3, x.indexof(' p'));

i want id number

you're there. use this:-

string z = x.substring(x.indexof("id:")+3, x.indexof("patient")-1);

+3 - because don't need id:

-1 - because don't need space before patient

this taking account there single space before patient, if not, @buhakesindi suggested use trim() method this:-

string z = x.substring(x.indexof("id:")+3, x.indexof("patient")); z = z.trim();

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