Amateur grass Java regular expressions, verifying phone numbers and phone numbers

Java Regular Expressions

The regular expression defines the pattern of the string.

Regular expressions can be used to search, edit, or manipulate text.

Regular expressions are not limited to a single language, but have subtle differences in each language.

Regular expression Instances

A string is actually a simple regular expression, such as the Hello world Regular expression that matches the "Hello World" string.

. (dot) is also a regular expression that matches any one of the words such as: "A" or "1".

The following table lists examples and descriptions of some regular expressions:

Regular Expressions	Description
This is text	Match string "This is text"
This\s+is\s+text	Note the \s+ in the string . The \s+ after matching the word "This" can match multiple spaces, then match the is string, then \s+ match multiple spaces and then follow the text string. Can match this instance: this is text
^\d+ (\.\d+)?	^ defined with what to start with \d+ match one or more numbers ? Setting the options in parentheses is optional \. Match "." Instances that can be matched: "5", "1.5", and "2.21".

Java Regular expressions are the most similar to Perl.

The Java.util.regex package mainly consists of the following three classes:

The
• pattern class:

  Pattern object is a compiled representation of a regular expression. The Pattern class has no public constructor method. To create a pattern object, you must first call its public static compilation method, which returns a Pattern object. The method takes a regular expression as its first argument.

• Matcher class: The

  Matcher object is the engine that interprets and matches the input string. Like the pattern class, Matcher does not have a public construction method. You need to invoke the Matcher method of the Pattern object to get a Matcher object.

• patternsyntaxexception:

  Patternsyntaxexception is a non-mandatory exception class that represents a syntax error in a regular expression pattern.

 /** * Get Current HttpSession * @author: Shijing * December 5, 2016 PM 3:46:02 * @return * * public static HttpSession getsess  Ion () {return getrequest (). GetSession ();  /** * Mobile phone number verification * @author: Shijing * December 5, 2016 PM 4:34:46 * @param str * @return Verified by return true */public static      Boolean ismobile (Final String str) {Pattern p = null;      Matcher m = null;      Boolean B = false; p = pattern.compile ("^[1][3,4,5,7,8][0-9]{9}$");      Verify the phone number m = P.matcher (str);      b = m.matches ();  return b; */** * Phone number verification * @author: Shijing * December 5, 2016 PM 4:34:21 * @param str * @return Verified by return true */public static      Boolean isphone (Final String str) {Pattern P1 = null, p2 = null;      Matcher m = null;      Boolean B = false;  P1 = Pattern.compile ("^[0][1-9]{2,3}-[0-9]{5,10}$");         Verify that the P2 with area code = pattern.compile ("^[1-9]{1}[0-9]{5,8}$");         Verify that there is no area code if (Str.length () > 9) {m = P1.matcher (str);      b = m.matches (); } else {m = P2.matcher (str);      b = m.matches ();  } return B;    } public static void Main (string[] args) {String phone = "13900442200";    String phone2 = "021-88889999";    String phone3 = "88889999";    String phone4 = "1111111111";    Test 1 if (Isphone (phone) | | ismobile (phone)) {System.out.println ("1 This is compliant");    }//Test 2 if (Isphone (phone2) | | ismobile (PHONE2)) {System.out.println ("2 This is compliant");    }//Test 3 if (Isphone (phone3) | | ismobile (PHONE3)) {System.out.println ("3 This is compliant");    }//Test 4 if (Isphone (phone4) | | ismobile (phone4)) {System.out.println ("4 This is compliant");    }else{System.out.println ("non-conforming"); }  }

　　

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Amateur grass Java regular expressions, verifying phone numbers and phone numbers