Java replaceAll不区分大小写
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2022-03-14 23:25:41
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Java 中replaceAll如何忽略大小写呢?
方式一:在正则表达式前面添加(?i)
@Test public void test_replaceAll33(){ String input = "I like Java,jAva is very easy and jaVa is so popular."; String replacement="cccc"; System.out.println(input); System.out.println(input.replaceAll("(?i)java", replacement)); }
测试结果:
方式二:使用Matcher 的appendReplacement 方法
@Test public void test_replaceAll(){ String input = "I like Java,jAva is very easy and jaVa is so popular."; String regex = "java"; String replacement="cccc"; StringBuffer sb =replaceAll2(input, regex, replacement); System.out.println(input); System.out.println(sb); } /*** * replaceAll,忽略大小写 * @param input * @param regex * @param replacement * @return */ public StringBuffer replaceAll2(String input,String regex,String replacement){ Pattern p = Pattern.compile(regex,Pattern.CASE_INSENSITIVE); Matcher m = p.matcher(input); StringBuffer sb = new StringBuffer(); boolean result = m.find(); while (result) { m.appendReplacement(sb, replacement); result = m.find(); } m.appendTail(sb); return sb; }
测试结果:
方式三:使用Matcher 的replaceAll
/*** * replaceAll,忽略大小写 * * @param input * @param regex * @param replacement * @return */ public String replaceAll3(String input, String regex, String replacement) { Pattern p = Pattern.compile(regex, Pattern.CASE_INSENSITIVE); Matcher m = p.matcher(input); String result = m.replaceAll(replacement); return result; } @Test public void test_replaceAll3() { String input = "I like Java,jAva is very easy and jaVa is so popular."; String regex = "java"; String replacement = "cccc"; String sb = replaceAll3(input, regex, replacement); System.out.println(input); System.out.println(sb); }
测试结果:
参考:http://hw1287789687.iteye.com/blog/2150892