publicStringreplaceFirst(String regex, String replacement){returnPattern.compile(regex).matcher(this).replaceFirst(replacement); } 二、replace方法 publicStringreplace(CharSequence target, CharSequence replacemen
从该方法中,我们可以看到,该方法中是一直循环直至find()返回false,每一次find匹配到换行(我们调用String.replaceAll时传入的匹配字符串是”\n”)都会执行appendReplacement方法,那么这个家伙到底做了什么呢? 1publicMatcher appendReplacement(StringBuffer sb, String replacement) {23//If no match, return error4if(f...
public String replace(CharSequence target, CharSequence replacement) { return Pattern.compile(target.toString(),Pattern.LITERAL).matcher(this).replaceAll(Matcher.quoteReplacement(replacement.toString())); } 三、replaceAll方法 public String replaceAll(String regex, String replacement) { return Pattern.compile...
public String replaceAll(String regex, String replacement)It accepts two parameters:regex – a regular expression used to match parts of the String replacement – the String that replaces each match foundNext, let’s see an example:String input = "Hello w o r l d"; String result = input....
public String extReplace(String input){ return extReplace(regexstr, input, false); } /** * 替换 * @param input 输入内容 * @param useGroupName 是否用到groupname 默认false * @return */ public String extReplace(String input, Boolean useGroupName){ ...
1、先原看看String类的replace方法的原码如下: public String replaceAll(String regex, String replacement) { return Pattern.compile(regex).matcher(this).replaceAll(replacement); } 1. 2. 3. 可以看出String类的replaceAll方法实际上是调用了Matcher类的replaceAll方法,查看Matcher类,replaceAll方法原码如下: ...
StringreplaceAll(Stringreplacement) Replaces every subsequence of the input sequence that matches the pattern with the given replacement string. StringreplaceFirst(Stringreplacement) Replaces the first subsequence of the input sequence that matches the pattern with the given replacement string. ...
public static void main(String[] args) { // 定义正则表达式 String regex ="d+"; // 匹配一个或多个数字 String text ="There are 123 numbers in this 456 string."; // 创建Pattern对象 Pattern pattern = Pattern.compile(regex); // 创建Matcher对象 ...
(?: Start repeating group: (?<!\\)(?:\\\)*\\" Match escaped " optionally prefixed by escaped \'s | or [^\r\n"] Match any character except " and linebreak )* End of repeating group ") Match terminating ", and end of capture group $1 Keep captured string literal 反对 回复...
publicStringgroup(intwhichGroup);// Reset methodspublicMatcherreset();publicMatcherreset(CharSequencenewInput);// Replacement methodspublicMatcherappendReplacement(StringBufferwhere,StringnewText);publicStringBufferappendTail(StringBufferwhere);publicStringreplaceAll(StringnewText);publicStringreplaceFirst(Stringnew...