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How to use regular expressions in Android, for this problem, this article introduces the corresponding analysis and solutions in detail, hoping to help more partners who want to solve this problem to find a more simple and easy way.

Verify the mobile phone number:

Public class ClassPathResource {public static boolean isMobileNO (String mobiles) {Pattern p = Pattern. Compile ("^ (([-]) | ([/ D])) | ([, -])) / / d {} $"); Matcher m = p.matcher (mobiles); System.out.println (m.matches () + "- -"); return m.matches () } public static void main (String [] args) throws IOException {System.out.println (ClassPathResource.isMobileNO ("));}} public class ClassPathResource {public static boolean isMobileNO (String mobiles) {Pattern p = Pattern .compile (" ^ (([-]) | ([^, / / D]) | ([, -])) / / d {} $"); Matcher m = p.matcher (mobiles) System.out.println (m.matches () + "- -"); return m.matches ();} public static void main (String [] args) throws IOException {System.out.println (ClassPathResource.isMobileNO ("));}}

Verify the mailbox:

Public static boolean isEmail (String strEmail) {String strPattern = "^ [a-zA-Z] [\\ w\\. -] * [a-zA-Z0-9] @ [a-zA-Z0-9] [\\ w\. -] * [a-zA-Z0-9]\. [a-zA-Z] [a-zA-Z\.] * [a-zA-Z] $"; Pattern p = Pattern.compile (strPattern); Matcher m = p.matcher (strEmail) Return m.matches ();} public static boolean isEmail (String strEmail) {String strPattern = "^ [a-zA-Z] [\\ w\\. -] * [a-zA-Z0-9] @ [a-zA-Z0-9] [\\ w\\. -] * [a-zA-Z0-9]\. [a-zA-Z] [a-zA-Z\\.] * [a-zA-Z] $"; Pattern p = Pattern.compile (strPattern) Matcher m = p.matcher (strEmail); return m.matches ();}

Check that what is entered in EditText conforms to the rules:

Import Android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button;import android.widget.EditText; public class Main extends Activity {private EditText editText; private Button button; @ Override public void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setContentView (R.layout.main); editText = (EditText) findViewById (R.id.textId); editText.setText ("EditText element"); button = (Button) findViewById (R.id.btnId) Button.setText ("Check"); button.setOnClickListener (new View.OnClickListener () {@ Override public void onClick (View v) {if (checkString (editText.getText (). ToString () {editText.setText ("Corect");} private boolean checkString (String s) {return s.matches ("\\ w * [.] (Java | cpp | class)") }} import Android.app.Activity; import android.os.Bundle; import android.view.View; import android.widget.Button; import android.widget.EditText; public class Main extends Activity {private EditText editText; private Button button; @ Override public void onCreate (Bundle savedInstanceState) {super.onCreate (savedInstanceState); setContentView (R.layout.main); editText = (EditText) findViewById (R.id.textId); editText.setText ("EditText element") Button = (Button) findViewById (R.id.btnId); button.setText ("Check"); button.setOnClickListener (new View.OnClickListener () {@ Override public void onClick (View v) {if (checkString (editText.getText (). ToString () {editText.setText ("Corect");}) } private boolean checkString (String s) {return s.matches ("\\ w * [.] (Java | cpp | class)");}}

Collection of common regular expressions

Regular expressions are used in string processing, form verification and other occasions, practical and efficient. Some commonly used expressions are collected here for a rainy day.

Regular expressions that match Chinese characters: [\ u4e00 -\ u9fa5]

Note: matching Chinese is really a headache. It's easy to have this expression.

Match double-byte characters (including Chinese characters): [^\ X00 -\ xff]

Note: can be used to calculate the length of a string (a double-byte character length meter 2 ~ ~ ASCII character counter 1)

A regular expression that matches a blank line:\ n\ s*\ r

Comment: can be used to delete blank lines

Regular expression that matches the HTML tag:] * >. *? |

Commentary: the version circulated on the Internet is too bad, the above one can only match part of it, and there is still nothing I can do about complex nested tags.

Regular expression that matches the leading and trailing white space characters: ^\ s* |\ s*

Comment: a very useful expression that can be used to delete white space characters (including spaces, tabs, page feeds, etc.) at the beginning and end of a line

The regular expression that matches the Email address:\ W + ([- +.]\ w +) * @\ w + ([-.]\ w +) *.\ w + ([-.]\ w +) *

Comment: form validation is very useful

Regular expression that matches the URL URL: [a-zA-z] +: / / [^\ s] *

Note: the function of the version circulated on the Internet is very limited, and the above version can basically meet the needs.

Match whether the account is legal (5-16 bytes are allowed at the beginning of the letter, and alphanumeric underscores are allowed): ^ [a-zA-Z] [a-zA-Z0-9 _] {4jue 15}

Comment: form validation is very useful

Match domestic phone number:\ d {3} -\ d {8} |\ d {4} -\ d {7}

Commentary: matching forms such as 0511-4405222 or 021-87888822

Match Tencent QQ number: [1-9] [0-9] {4,}

Commentary: Tencent QQ starts from 10000

Match the postcode of China: [1-9]\ d {5} (?!\ d)

Commentary: the postal code of China is 6 digits

Match ID:\ d {15} |\ d {18}

Commentary: Chinese ID cards are 15 or 18 digits

Match ip address:\ d +\.\ d +\.\ d +

Note: useful when extracting ip addresses

Match specific numbers:

^ [1-9]\ d * / / match positive integers

^-[1-9]\ d * / / match negative integers

^ -? [1-9]\ d * / / matching integers

^ [1-9]\ d* | 0 / / matches a non-negative integer (positive integer + 0)

^-[1-9]\ d* | 0 / matches non-positive integers (negative integers + 0)

^ [1-9]\ d *\.\ d * | 0\.\ d * [1-9]\ d * / matches positive floating point numbers

^-([1-9]\ d *.\ d * | 0\.\ d * [1-9]\ d *) / / match negative floating point numbers

^ -? ([1-9]\ d *.\ d * | 0\.\ d * [1-9]\ d * | 0?\ .0 + | 0) / / match floating point number

^ [1-9]\ d *.\ d * | 0\.\ d * [1-9]\ d * | 0?\ .0 + | 0 / / matches non-negative floating point numbers (positive floating point number + 0)

^ (- ([1-9]\ d *\.\ d * | 0\.\ d * [1-9]\ d *)) | 0?\ .0 + | 0 / / matches non-positive floating point numbers (negative floating point + 0)

Commentary: useful when dealing with a large amount of data, pay attention to corrections in specific applications

Match a specific string:

^ [A-Za-z] + / / matches a string of 26 English letters

^ [Amurz] + / / matches a string consisting of 26 English letters in uppercase

^ [amurz] + / / matches a string of 26 lowercase letters

^ [A-Za-z0-9] + / / matches a string of numbers and 26 letters

^\ w + / / matches a string consisting of numbers, 26 English letters, or underscores

Commentary: some of the most basic and most commonly used expressions

This is the answer to the question about how to use regular expressions in Android. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel for more related knowledge.

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