Java正则表达式在字符串中的某个单词之前和之后获得2个字符串

时间:2014-09-02 20:08:34

标签: java regex

例如我有这个文本和电子邮件:

String text ="For move information please contact us: contact@gmail.com, ask Peter to help."
String email="contact@gmail.com";

我希望得到两个10个字符大小的字符串,一个来自电子邮件的左侧,另一个来自右侧。 结果我想看 -ntact us:正确 :,问Pete

现在, matcher.find()在while循环中返回 false 。因此, leftContext rightContext 都为空。

这是我的代码:

String email = "contact@gmail.com";
int nLeft = 5;
int nRight = 5;
String leftContext;
String rightContext;

String wordDelRegEx = "[^а-яА-Яa-zA-Z0-9.-]+?";
        String leftRegEx = "(\\w{" + nLeft + "})";
        String rightRegEx = "(\\w{" + nRight + "})";

        //matches something like: aaaaaaa email@gmail.com bbbbbbbbbb
        String contextRe = leftRegEx + wordDelRegEx +email + wordDelRegEx + rightRegEx;

        String h ="For move information please contact us: contact@gmail.com, ask Peter to help."
        Pattern pattern = Pattern.compile(contextRe);
        Matcher matcher = pattern.matcher(h);

        while (matcher.find()) {
            leftContext = matcher.group(1);
            rightContext = matcher.group(2);
        }

        System.out.println("Left: " + leftContext);
        System.out.println("Right: " + rightContext);

1 个答案:

答案 0 :(得分:0)

使用以下字符串包含冒号(:),逗号(,)和空格(\ s):

没有使用wordDelRegEx变量:

String leftRegEx = "([\\w\\s,:]{" + nLeft + "})";

String rightRegEx = "([\\w\\s,:]{" + nRight + "})";

//匹配如下内容:aaaaaaa email@gmail.com bbbbbbbbbb

String contextRe =leftRegEx+ email +rightRegEx;