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Java's method of matching a phone number in a string using regularity

Popularity：230 ℃/2024-08-08 21:37:10

1. Use regular expressions to match phone numbers

Matching phone numbers using regular expressions is a common requirement in Java. The format of a phone number may vary from country to country, but a typical format might look like this:(123) 456-7890. In this example, I will provide a Java program that uses regular expressions to match phone numbers in this format.

First, we need to understand regular expressions for phone numbers. In this example, we will use the following regular expression:

regex copy code

\(\d{3}\) \d{3}-\d{4}

This expression means:

  • \( cap (a poem)\) match brackets()。
  • \d{3} Match 3 numbers.
  • Space matches space characters.
  • \d{3}-\d{4} Match 3 numbers, a hyphen, then 4 numbers.

Next, let's look at how to use this regular expression to match phone numbers in Java code:

import ;
import ;
  
public class PhoneNumberMatcher {
    public static void main(String[] args) {
        // Test String
        String text = "Here is a sample text with a phone number (123) 456-7890 in it.";
          
        // regular expression (math.)
        String regex = "\\(\\d{3}\\) \\d{3}-\\d{4}";
          
        // establish Pattern boyfriend
        Pattern pattern = (regex);
          
        // establish matcher boyfriend
        Matcher matcher = (text);
          
        if (()) {
            ("Found a phone number: " + ());
        } else {
            ("No phone number found.");
        }  
    }  
}

This code first imports the necessaryPatternrespond in singingMatcherclass, then defines a test string and a regular expression. Next, it uses the()method compiles the regular expression and uses thematcher()method createsMatcherobject. Finally, use thefind()method to find matches and use thegroup()method outputs the found phone number.

This code is a complete Java program that can be run directly and tests the functionality of regular expressions to match phone numbers. By modifying the test string, we can test different phone number formats.

2. Example of using Java regular expressions to match phone numbers

Here are some examples of using Java regular expressions to match phone numbers. Each example contains a test string and a regular expression, and how to use thePatterncap (a poem)Matcherclass to find and match phone numbers.

2.1 Example 1: Matching Standard Format Phone Numbers

import ;
import ;
  
public class PhoneNumberMatcher {
    public static void main(String[] args) {
        // Test String
        String text = "Call me at (123) 456-7890 or visit my website.";
          
        // regular expression (math.)
        String regex = "\\(\\d{3}\\) \\d{3}-\\d{4}";
          
        // establish Pattern boyfriend
        Pattern pattern = (regex);
          
        // establish matcher boyfriend
        Matcher matcher = (text);
          
        if (()) {
            ("Found a phone number: " + ());
        } else {
            ("No phone number found.");
        }  
    }  
}

Output:

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Found a phone number: (123) 456-7890

2.2 Example 2: Matching Phone Numbers with Spaces and Parentheses

import ;
import ;
  
public class PhoneNumberMatcher {
    public static void main(String[] args) {
        // Test String
        String text = "My phone number is ( 123 ) 456 - 7890. Please call me.";
          
        // regular expression (math.)，Allow spaces
        String regex = "\\(\\s*\\d{3}\\s*\\)\\s*\\d{3}-\\d{4}";
          
        // establish Pattern boyfriend
        Pattern pattern = (regex);
          
        // establish matcher boyfriend
        Matcher matcher = (text);
          
        if (()) {
            ("Found a phone number: " + ());
        } else {
            ("No phone number found.");
        }  
    }  
}

Output:

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Found a phone number: ( 123 ) 456 - 7890

2.3 Example 3: Matching Phone Numbers in Multiple Formats

import ;
import ;
  
public class PhoneNumberMatcher {
    public static void main(String[] args) {
        // Test String
        String text = "You can reach me at (123) 456-7890 or 123.456.7890 or 123-456-7890.";
          
        // regular expression (math.)，Match multiple formats
        String regex = "\\(\\d{3}\\)\\s*\\d{3}-\\d{4}|\\d{3}[.-]\\d{3}[.-]\\d{4}|\\d{3}-\\d{3}-\\d{4}";
          
        // establish Pattern boyfriend
        Pattern pattern = (regex);
          
        // establish matcher boyfriend
        Matcher matcher = (text);
          
        while (()) {
            ("Found a phone number: " + ());
        }  
    }  
}

Output:

Found a phone number: (123) 456-7890  
Found a phone number: 123.456.7890  
Found a phone number: 123-456-7890

These examples show how to use Java regular expressions to match phone numbers in different formats. We can adjust the regular expressions to match specific phone number formats as needed.

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