java - 为什么以下正则表达式在通过 Spring 输入时不起作用

Question

这是 Spring 配置:

<bean id="wrapInMarginalMarkup" class="com.a.ChangeContentAction">
        <property name="regEx">
            <bean class="java.util.regex.Pattern" factory-method="compile">
                <constructor-arg value="(.*)(&lt;m&gt;)(.*)(&lt;xm&gt;)(.*)" />
            </bean>
        </property>
        <property name="replaceExpression" value="$1&lt;marginal\.markup&gt;$3&lt;/marginal\.markup&gt;$5" />
    </bean>

该类接受 java 中的参数，例如:

   private Pattern regEx;
    private String replaceExpression;

    /**
     * {@inheritDoc}
     */
    @Override
    public int execute(final BuilderContext context, final Paragraph paragraph)
    {
        String content = paragraph.getContent();
        paragraph.setContent(regEx.matcher(content).replaceAll(replaceExpression));
    }

这是将在模式上匹配的字符串的样子:

"Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled,,<m>Surface Transportation Extension Act of 2012.,<xm>"

它似乎并没有真正替换这里的标记，问题是什么？

我希望输出字符串看起来像:

"Be it enacted by the Senate and House of Representatives of the United States of America in Congress assembled,,<marginal.markup>Surface Transportation Extension Act of 2012.,</marginal.markup>"

Answer 1

由于您在 Spring XML 文件中使用转义实体，因此传递给 compile() 方法的实际模式不是

(.*)(<m>)(.*)(<xm>)(.*)

但是

(.*)(<m>)(.*)(<xm>)(.*)

如果你想通过第一个模式，你必须转义和号:

(.*)(<m>)(.*)(<xm>)(.*)