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How to check a string starts with numeric number?

String str = "123abcd"; boolean isStartWithDigit = Character.isDigit(s.charAt(0));
System.out.println("isStartWithDigit: "+isStartWithDigit);


How to get first numeric value from a string in java? 

Matcher matcher = Pattern.compile("\\d+").matcher(titleStr);
if(matcher.find()) { System.out.println(matcher.group());
};


How to check if a String contains another String in a case insensitive manner in Java?

Solution 1:
String str = "I am Java Developer"; String test = "java"; Boolean bool = str.toLowerCase().contains(test.toLowerCase()); System.out.println(bool);

Solution 2:
org.apache.commons.lang3.StringUtils.containsIgnoreCase("AbBaCca", "bac");

Solution 3:
Pattern.compile(Pattern.quote(s2), Pattern.CASE_INSENSITIVE).matcher(s1).find();