Regex for social security number validation
United States Social Security numbers are nine-digit numbers in the format AAA-GG-SSSS with following rules.
Regex : ^(?!000|666)[0-8][0-9]{2}-(?!00)[0-9]{2}-(?!0000)[0-9]{4}$
^ # Assert position at the beginning of the string.
(?!000|666) # Assert that neither "000" nor "666" can be matched here.
[0-8] # Match a digit between 0 and 8.
[0-9]{2} # Match a digit, exactly two times.
- # Match a literal "-".
(?!00) # Assert that "00" cannot be matched here.
[0-9]{2} # Match a digit, exactly two times.
- # Match a literal "-".
(?!0000) # Assert that "0000" cannot be matched here.
[0-9]{4} # Match a digit, exactly four times.
$ # Assert position at the end of the string.
static String regex = "^(?!000|666)[0-8][0-9]{2}-(?!00)[0-9]{2}-(?!0000)[0-9]{4}$";
private static Pattern emailPattern = Pattern.compile(regex);
public static Boolean isValidSSNFormat(String ssn) {
if(ssn==null || ssn.length()==0) {
return false;
}
return emailPattern.matcher(ssn).matches();
}
Regex for email validation
public class EmailRegex {
static String regex = "^[a-zA-Z0-9_!#$%&’*+/=?`{|}~^.-]+@[a-zA-Z0-9.-]+$";
private static Pattern emailPattern = Pattern.compile(regex);
public static Boolean isValidEmailFormat(String email) {
if(email==null || email.length()==0) {
return false;
}
return emailPattern.matcher(email).matches();
}
}
public class EmailRegexDemo {
public static void main(String[] args) {
String email = "folau@gmail.com";
boolean valid = EmailRegex.isValidEmailFormat(email);
System.out.println(email+" is a valid email = "+valid);
}
}
Regex for password validation
Password validation is the need for almost all the applications today. There are various ways to do validate passwords from writing everything manually to use third party available APIs.
static String regex = "((?=.*[a-z])(?=.*d)(?=.*[@#$%])(?=.*[A-Z]).{6,16})";
/*
* (?=.*[a-z]) : This matches the presence of at least one lowercase letter.
* (?=.*d) : This matches the presence of at least one digit i.e. 0-9.
* (?=.*[@#$%]) : This matches the presence of at least one special character.
* ((?=.*[A-Z]) : This matches the presence of at least one capital letter.
* {6,16} : This limits the length of password from minimum 6 letters to maximum 16 letters.
*/
public static Boolean isValidPasswordFormat(String password) {
if(password==null || password.length()==0) {
return false;
}
return Pattern.compile(regex).matcher(password).matches();
}
US zipcode regex validation
/*
* ^ # Assert position at the beginning of the string.
* [0-9]{5} # Match a digit, exactly five times.
* (?: # Group but don't capture:
* - # Match a literal "-".
* [0-9]{4} # Match a digit, exactly four times.
* ) # End the non-capturing group.
* ? # Make the group optional.
* $ # Assert position at the end of the string.
*/
static String US_ZIPCODE_REGEX = "^[0-9]{5}(?:-[0-9]{4})?$";
public static Boolean isValidUSZipcodeFormat(String zipcode) {
if(zipcode==null || zipcode.length()==0) {
return false;
}
return Pattern.compile(US_ZIPCODE_REGEX).matcher(zipcode).matches();
}
public class ZipcodeDemo {
public static void main(String[] args) {
List<String> zips = new ArrayList<String>();
//Valid ZIP codes
zips.add("12345");
zips.add("12345-6789");
//Invalid ZIP codes
zips.add("123456");
zips.add("1234");
zips.add("12345-678");
zips.add("12345-67890");
for (String zip : zips)
{
boolean valid = ZipcodeRegex.isValidUSZipcodeFormat(zip);
System.out.println(zip+" is a valid US zipcode? "+valid);
}
}
}
12345 is a valid US zipcode? true 12345-6789 is a valid US zipcode? true 123456 is a valid US zipcode? false 1234 is a valid US zipcode? false 12345-678 is a valid US zipcode? false 12345-67890 is a valid US zipcode? false
UK zipcode regex validation
static String UK_ZIPCODE_REGEX = "^[A-Z]{1,2}[0-9R][0-9A-Z]? [0-9][ABD-HJLNP-UW-Z]{2}$";
public static Boolean isValidUKZipcodeFormat(String zipcode) {
if(zipcode==null || zipcode.length()==0) {
return false;
}
return Pattern.compile(UK_ZIPCODE_REGEX).matcher(zipcode).matches();
}
Regex for number of lines
StringBuilder line = new StringBuilder();
line.append("Hey man");
line.append("\n");
line.append("I like Java");
line.append("\n");
boolean valid = StringRegex.isValidLines(line.toString(), 2);
System.out.println("does \n===\n" + line.toString() + "===\nhas 2 lines? " + valid);
Regex for number of words
public static Boolean isValidLength(String str, int length) {
String regex = "^\\W*(?:\\w+\\b\\W*){1,"+length+"}$";
return Pattern.compile(regex).matcher(str).matches();
}
public class StringRegexDemo {
public static void main(String[] args) {
List<String> inputs = new ArrayList<String>();
inputs.add("Folaulau");
inputs.add("JAVA is great");
inputs.add("I love java programming");
inputs.forEach((input) -> {
int length = 10;
boolean valid = StringRegex.isValidLength(input, length);
System.out.println("is " + input + " " + length + " in length? " + valid);
});
}
}
# output
is Folaulau 10 in length? true
is JAVA is great 10 in length? true
is I love java programming 10 in length? true
Regex for ISBN
ISBN-10 or ISBN-13 : ^(?:ISBN(?:-1[03])?:? )?(?=[0-9X]{10}$|(?=(?:[0-9]+[- ]){3})
[- 0-9X]{13}$|97[89][0-9]{10}$|(?=(?:[0-9]+[- ]){4})[- 0-9]{17}$)
(?:97[89][- ]?)?[0-9]{1,5}[- ]?[0-9]+[- ]?[0-9]+[- ]?[0-9X]$
public class RegexISNBDemo {
public static void main(String[] args) {
List<String> isbns = new ArrayList<String>();
//Valid ISBNs
isbns.add("0-596-52068-9");
isbns.add("0 512 52068 9");
isbns.add("ISBN-10 0-596-52068-9");
isbns.add("ISBN-10: 0-596-52068-9");
//Invalid ISBNs
isbns.add("0-5961-52068-9");
isbns.add("11 5122 52068 9");
isbns.add("ISBN-13 0-596-52068-9");
isbns.add("ISBN-10- 0-596-52068-9");
isbns.forEach((isbn)->{
boolean valid = RegexISNB.isValidISBNFormat(isbn);
System.out.println("is "+isbn+" a valid ISBN? "+valid);
});
}
}
is 0-596-52068-9 a valid ISBN? true is 0 512 52068 9 a valid ISBN? true is ISBN-10 0-596-52068-9 a valid ISBN? true is ISBN-10: 0-596-52068-9 a valid ISBN? true is 0-5961-52068-9 a valid ISBN? false is 11 5122 52068 9 a valid ISBN? false is ISBN-13 0-596-52068-9 a valid ISBN? true is ISBN-10- 0-596-52068-9 a valid ISBN? false
Remove special characters from file name
/*
* Only alphabets[a-z] and digits[0-9], dot, underscore, dash
*/
String alphaAndDigits = "[^a-zA-Z0-9.-_]+";
String newFileName = fileName.replaceAll(alphaAndDigits, "");
@Test
public void test_replace_invalid_characters() {
String fileName = "test .jpg";
String newFileName = FileUtils.replaceInvalidCharacters(fileName);
System.out.println("newFileName=" + newFileName);
fileName = "test]&.jpg";
newFileName = FileUtils.replaceInvalidCharacters(fileName);
System.out.println("newFileName=" + newFileName);
fileName = "test$.jpg";
newFileName = FileUtils.replaceInvalidCharacters(fileName);
System.out.println("newFileName=" + newFileName);
fileName = "test@=`.jpg";
newFileName = FileUtils.replaceInvalidCharacters(fileName);
System.out.println("newFileName=" + newFileName);
}
newFileName=test.jpg newFileName=test.jpg newFileName=test.jpg newFileName=test.jpg