java regular expression example

using the Pattern.compile function, you can add parameters that control the matching behavior of the Java regular expression:Pattern Pattern.compile (String regex, int flag)The value range of flag is as follows:Pattern.canon_eq The match is determined only if the "normal decomposition (canonical decomposition)" of the two characters is identical. For example, af

Based on the compiled regular expression. Multiple matcher instances can share a pattern object. Now let's take a look at a simple example and analyze it to learn how to generate a pattern object and compile a regular expression. Finally, we can split the target string base

Regular Expression. python is used as an example. The original address and author must be specified for reprinting. The purpose of a regular expression is to quickly process string content. It is mainly used to find the specified string and complete the task with other opera

JJJJJboth take a "|" j| A J or ajava| Hello java or helloA combination type is specified in "()" For example, I query When using the Pattern.compile function, you can add parameters that control the matching behavior of the Java regular expression:Pattern Pattern.compile (String regex, int flag)The range of values for

Java Regular Expression: does not contain a rule string, java rule stringOverview For log analysis, you often need to deal with thousands of log entries. To find data in a specific mode in a large amount of data, you often need to write many complex regular expressions. For

C # Regular Expression tutorial and example, For a while, regular expression learning was very popular. At that time, I could see several regular expression posts in one day at CSDN, du

that uses regular expressions to match IP addresses and convert IP addresses to corresponding values:Function IP2V (ip){Re =/(\ d +) \. (\ d +)/g // Regular Expression matching IP addressesIf (re. test (ip )){Return RegExp. $1 * Math. pow (255) + RegExp. $2 * Math. pow () + RegExp. $3 * + RegExp. $4*1}Else{Throw new Error ("Not a valid IP address! ")}}However, i

arbitrary charactersMore than one arbitrary character between J. + d j and D You can use "?" When the limit is 0 or more times for a specific character 「?」Ja? J or ja appears Limit to the number of consecutive occurrences of the specified character "{}」J {2} jjJ {3} jjjMore than a characters, and "{,}」J {3,} jjj, jjjj, jjjjj ,??? (More than three J events coexist)More than one text, less than B "{a, B }」J {3, 5} jjj, jjjj, or jjjjjTake the two as "| 」J | a j orJava | Hello

string @test public void testRegex6 () {string regex = "\\d"; String input = "Hello3world5hello8java"; Pattern p = pattern.compile (regex); String strs[] = p.split (input);//output: Hello World Hello java for (String str:strs) {System.out.print (str + "");}}6. Pattern.quote () static methodGets a regular expression that matches this string@Test public void testR

consecutive occurrences of the specified number of characters "{a}"J{2} JJJ{3} JJJText more than a, and "{a,}"J{3,} jjj,jjjj,jjjjj,??? (3 times above J co-exist)More than one word, B below "{a,b}"j{3,5} JJJ or JJJJ or JJJJJTake a "|" of both.j| A J or ajava| Hello java or helloA combination type is specified in "()"For example, I query When using the Pattern.compile function, you can add parameters that co

); System.out.println ("Commentlines:" + commentlines); System.out.println ("Whitelines:" + whitelines); private static void Parse (File f) {bufferedreader br = null; Indicates whether to start Boolean comment = False for the comment; try {br = new BufferedReader (new FileReader (f)); String Line = ""; while (line = Br.readline ())!= null) {//Remove the blank line = Line.trim () that may appear before the annotation character/*; Empty line because ReadLine () has remo

arbitrary character between J. + d j and D You can use "?" When the limit is 0 or more times for a specific character 「?」Ja? J or ja appears Limit to the number of consecutive occurrences of the specified character "{}」J {2} jjJ {3} jjjMore than a characters, and "{,}」J {3,} jjj, jjjj, jjjjj ,??? (More than three J events coexist)More than one text, less than B "{a, B }」J {3, 5} jjj, jjjj, or jjjjjTake the two as "| 」J | a j orJava | Hello Java or

For example, to count the workload of a Java programmer writing code in one day (for example, the number of lines of valid code, the number of blank lines, and the number of lines of comments), this tool may serve as a reference. Idea: because the content of each Java source file consists of

use "?" When the limit is 0 or more times for a specific character 「?」JA? J or JA appears Limit to the number of consecutive occurrences of the specified character "{}」J {2} JJJ {3} JJJMore than a characters, and "{,}」J {3,} JJJ, JJJJ, JJJJJ ,??? (More than three J events coexist)More than one text, less than B "{a, B }」J {3, 5} JJJ, JJJJ, or JJJJJTake the two as "| 」J | a j orJava | Hello Java or HelloSpecifies a combination type in "()".For

Java Regular Expression application Summary 08:45:17 Copyright statement: original works are not reprinted! Otherwise, legal liability will be held. Java Regular Expression application Summary I. Overview

Regular can be regarded as a DSL, but it is very widely used, it can easily solve many scenarios of string matching, filtering problems. At the same time, there is an old saying:"If you have a problem with regular expressions, then you have two problems now. ” Some people, when confronted with a problem, think "I know, I'll use regular expressions." Now