如何判断Java字符串是否包含X或Y,以及是否包含Z

string s = test_string.toLowerCase();
if (s.contains("parsing") && (s.contains("error") || s.contains("warning")) {
    ....

(?i)(?=.*parsing)(.*(error|warning).*)

正向先行断言

(?i)(?=.*?(?:ERROR|WARNING))(?=.*?parsing).*

示例:

Pattern p = Pattern.compile("(?=.*?(?:ERROR|WARNING))(?=.*?parsing).*", Pattern.CASE_INSENSITIVE); // you can also use (?i) at the beginning
System.out.println(p.matcher("WARNING at line X doing parsing of Y").matches()); // true
System.out.println(p.matcher("An error at line X doing parsing of Y").matches()); // true
System.out.println(p.matcher("ERROR Hello parsing world").matches()); // true       
System.out.println(p.matcher("A problem at line X doing parsing of Y").matches()); // false

 If((str.indexOf("WARNING") > -1 || str.indexOf("ERROR") > -1) && str.indexOf("parsin") > -1)

this applet

if (str.matches("(?i)^.*?(WARNING|ERROR).*?parsing.*$")) {
...

if((string1.toUpperCase().indexOf("ERROR",0) >= 0 ||  
  string1.toUpperCase().indexOf("WARNING",0) >= 0 ) &&
  string1.toUpperCase().indexOf("PARSING",0) >= 0 )

(.*(ERROR|WARNING).*parsing)|(.*parsing.*(ERROR|WARNING))

String mystring = "Text I want to match";
String[] matchings = {"warning", "error", "parse", ....}
int matches = 0;
for (int i = 0; i < matchings.length(); i++) {
  if (mystring.contains(matchings[i]) {
    matches++;
  }
}

if (matches == matchings.length) {
   System.out.println("All Matches found");
} else {
   System.out.println("Some word is not matching :(");
}

.* 构造解析器将调用数千个“回退并重试”试验匹配。