Help in java regex.

Question

Here are some phone numbers.

I want to print all phone number without prefix and 0.

Note :- phone number should be 10 digit long without
(+91 and space and 0)

String a = "[phone] "
+ "[phone]"
+ "9075123456"
+ "08409123456";

// My code for this..

a = a.replaceAll("\\+91", "");

Pattern p = Pattern.compile("(0)?(\\d{10})");

/* I putted (0)? Because , if i don't put this, the last digit of the phone number which starts with 0 won't print. */

Matcher m = p.matcher(a);

While(m.find()){
System.out.println(m.group());
}

All prints fine , but in the last phone number. 0 also getting printed.

Answer 1

@LeoBeliik

aah. thanks. now it works fine..

but , i also achieved it. In a very long way..

first converted string into array
took a number first then converted in char then take out its 0th index compared it then against the 0th index..

pheww. that was a lot of hard work...

take a look at the code.. you'll be like OMG!!

public static void sortMobileNo(String array[]) {

for (int i = 0; i < array.length; i++) {
String str = array[i];
char ch[] = str.toCharArray();
if (ch[0] == '0') {
str = str.replaceFirst("0", "");
array[i] = str;
} else if (ch[0] == '+') {
str = str.replaceAll("\\+91", "");
array[i] = str;

}
}

for (int i = 0; i < array.length; i++) {
String str = array[i];
Pattern p = Pattern.compile("(\\d){10}");
Matcher m = p.matcher(str);

while (m.find()) {

System.out.println(m.group());

}

}

PLEASE SAY SOME WORDS FOR MY CODE. hehehe

Answer 2

LeoBeliik yeah..this is also nice

I don't know many predefined method.

I guess . I always write long codes for do something.. i never searched for any extra method on google....

I just know that methods. Which a tutorial has on that java course.

Thanks, for your help.
I really appreciate it.

Answer 3

LeoBeliik
When you said you don't need to do regex.. i was like , i am forgetting something..

now i remember why i used regex... Becuase here i putted email, name and phone in a single array... That's why i used regex...

Hehe

Answer 4

LeoBeliik

Answer 5

LeoBeliik yeah...
Thanks for the advice 😊