number regex java
String regex = "[0-9]+"; // or String regex = "\\d+";
String str = "123";
System.out.println(str.matches(regex)); // true
str = "12a";
System.out.println(str.matches(regex)); // falsenumber regex java
String regex = "[0-9]+"; // or String regex = "\\d+";
String str = "123";
System.out.println(str.matches(regex)); // true
str = "12a";
System.out.println(str.matches(regex)); // falsejava regex 10 digit number
String regex = "^\\d{10}$";
Pattern pattern = Pattern.compile(regex);
Matcher matcher = pattern.matcher("9876543210");
matcher.matches(); // returns true if pattern matches, else returns falsenumber of matches regex java
// Java 9+
long matches = matcher.results().count();
// Java 8-
int count = 0;
while (matcher.find())
{
count++;
}Copyright © 2021 Codeinu
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