Regular expressions are powerful, but with great power comes great responsibility. Because of the way most regex engines work, it is surprisingly easy to construct a regular expression that can take a very long time to run. In my previous post on reg
使用repalceAll 方法出现java.util.regex.PatternSyntaxException: Dangling meta character '*' near index 0异常 代码如下: @Test public void testReplaceAll(){ String sql = "select * from per_handle where id not in('3ce7405509414105a65e7456987e7393')"; String cou
1. regex with variable example: find the number and put a parenthese around the number. output: a(5265)b String field = "a5265b"; String result = field.replaceAll("(\\d+)", "($1)");
通常情况下,我们判断一个字符串中是否存在某值常常会用string.contains,其实判断一个字符串中存在某值的方法有很多种,最常用的就是前述所说的string.contains,相对来说比较常用的还有string.IndexOf和Regex.Match.直接上代码,后面在说些什么吧,通常情况下功能的实现最重要,作者的话,只对有心者有效. using System; using System.Collections.Generic; using System.Linq; using Syste
Review of Regex Symbols This chapter covered a lot of notation, so here’s a quick review of what you learned: The ? matches zero or one of the preceding group. The * matches zero or more of the preceding group. The + matches one or more of the preced
package com.demo.regex; import java.util.regex.Matcher; import java.util.regex.Pattern; /** * @author Administrator * */ public class RegexMatches { public static void main(String[] args) { String line="This order was placed for QT3000! OK?"; St