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java正则表达式 判断字符串是否含有字母

程序员文章站 2022-03-25 08:52:01
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 1 判断字符串是否含有字母

            if (Pattern.matches(".*[A-Za-z]+.*", IP)) {//"1e1.4.5.6"匹配
            if (Pattern.matches(".*[a-zA-Z]+.*", IP)) {//"1e1.4.5.6"匹配
            if (Pattern.matches(".*([A-Z]|[a-z])+.*", IP)) {//"1e1.4.5.6"匹配,需要加()
            if (Pattern.matches(".*[A-Z]|[a-z]+.*", IP)) {//"1e1.4.5.6"不匹配
            if (Pattern.matches(".*[A-Z][a-z]+.*", IP)) {//"1e1.4.5.6"不匹配
            if (Pattern.matches(".*[a-z][A-Z]+.*", IP)) {//"1e1.4.5.6"不匹配

 

        System.out.println(Pattern.matches(".*([A-Z]|[a-z])+.*", "12313"));//false
        System.out.println(Pattern.matches(".*([A-Z]|[a-z])+.*", "12313aa"));//true
        System.out.println(Pattern.matches(".*([A-Z]|[a-z])+.*", "12313Aa"));//true
        System.out.println(Pattern.matches(".*([A-Z]|[a-z])+.*", "12AA313"));//true
        System.out.println(Pattern.matches(".*([A-Z]|[a-z])+.*", "aA12313"));//true
        System.out.println(Pattern.matches(".*([A-Z]|[a-z])+.*", "aA.12313"));//true

        System.out.println(Pattern.matches(".*[A-Za-z]+.*", "12313"));//false
        System.out.println(Pattern.matches(".*[A-Za-z]+.*", "12313"));//false
        System.out.println(Pattern.matches(".*[A-Za-z]+.*", "12313aa"));//true
        System.out.println(Pattern.matches(".*[A-Za-z]+.*", "12313Aa"));//true
        System.out.println(Pattern.matches(".*[A-Za-z]+.*", "12AA313"));//true
        System.out.println(Pattern.matches(".*[A-Za-z]+.*", "aA12313"));//true
        System.out.println(Pattern.matches(".*[A-Za-z]+.*", "aA.12313"));//true

        System.out.println(Pattern.matches(".*[a-zA-Z]+.*", "12313"));//false
        System.out.println(Pattern.matches(".*[a-zA-Z]+.*", "12313aa"));//true
        System.out.println(Pattern.matches(".*[a-zA-Z]+.*", "12313Aa"));//true
        System.out.println(Pattern.matches(".*[a-zA-Z]+.*", "12AA313"));//true
        System.out.println(Pattern.matches(".*[a-zA-Z]+.*", "aA12313"));//true
        System.out.println(Pattern.matches(".*[a-zA-Z]+.*", "aA.12313"));//true

2 [a-z][A-Z]分别代表不同的两个字符

if (Pattern.matches(".*[a-z][A-Z]+.*", IP)) {//"1eA.4.5.6"匹配
if (Pattern.matches(".*[A-Z][a-z]+.*", IP)) {//"1Ae.4.5.6"匹配
        System.out.println(Pattern.matches(".*[a-z][A-Z]+.*", "1eA.4.5.6"));//true
        System.out.println(Pattern.matches(".*[A-Z][a-z]+.*", "1eA.4.5.6"));//false
        System.out.println(Pattern.matches(".*[A-Z][a-z]+.*", "1Ae.4.5.6"));//true

以上基于jdk1.8

相关标签： java 正则表达式 字符串 字母

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