优化这段代码private static final Pattern P_UNQUOTED_ATTRIBUTES = Pattern.compile("([a-z0-9]+)(=)([^\"\\s']+)", Pattern.CASE_INSENSITIVE | Pattern.DOTALL)

这段代码的主要作用是匹配HTML标签中非引号包裹的属性，其正则表达式为`([a-z0-9]+)(=)([^\"\\s']+)`。

为了优化这段代码，可以考虑以下几个方面：

1. 编译正则表达式对象一次后重复使用：将Pattern对象定义成静态变量，避免每次调用时都重新编译一次正则表达式。

2. 使用预编译的字符类：将`[a-z0-9]`替换成`\w`，表示匹配所有字母和数字字符。

3. 使用引号限定符：将`[^\"\\s']+`替换成`\"([^\"]*)\"|'([^']*)'`，表示匹配双引号或单引号包裹的属性值。

优化后的代码如下所示：

private static final Pattern P_UNQUOTED_ATTRIBUTES = Pattern.compile("\\w+=(\"([^\"]*)\"|'([^']*)')", Pattern.CASE_INSENSITIVE | Pattern.DOTALL);

相关问题

Parse error. Expected a command name, got unquoted argument with text [cmake] "-DCMAKE_VERBOSE_MAKEFILE=ON".

这个错误信息通常是因为在 CMakeLists.txt 文件中使用了不被支持的语法或者命令。根据错误信息，似乎是在 CMakeLists.txt 文件中使用了类似于 `[cmake] "-DCMAKE_VERBOSE_MAKEFILE=ON"` 的不带引号的参数。

请检查你的 CMakeLists.txt 文件是否存在类似的语句，如果有，请确保将参数用引号括起来，例如：`"[cmake] -DCMAKE_VERBOSE_MAKEFILE=ON"`。

private final CharSequence getSmallTime() { Context context = getContext(); boolean is24 = DateFormat.is24HourFormat(context); LocaleData d = LocaleData.get(context.getResources().getConfiguration().locale); final char MAGIC1 = '\uEF00'; final char MAGIC2 = '\uEF01'; SimpleDateFormat sdf; String format = is24 ? d.timeFormat24 : d.timeFormat12; if (!format.equals(mClockFormatString)) { /* * Search for an unquoted "a" in the format string, so we can * add dummy characters around it to let us find it again after * formatting and change its size. */ if (AM_PM_STYLE != AM_PM_STYLE_NORMAL) { int a = -1; boolean quoted = false; for (int i = 0; i < format.length(); i++) { char c = format.charAt(i); if (c == ''') { quoted = !quoted; } if (!quoted && c == 'a') { a = i; break; } } if (a >= 0) { // Move a back so any whitespace before AM/PM is also in the alternate size. final int b = a; while (a > 0 && Character.isWhitespace(format.charAt(a-1))) { a--; } format = format.substring(0, a) + MAGIC1 + format.substring(a, b) + "a" + MAGIC2 + format.substring(b + 1); } } mClockFormat = sdf = new SimpleDateFormat(format); mClockFormatString = format; } else { sdf = mClockFormat; } String result = sdf.format(mCalendar.getTime()); if (AM_PM_STYLE != AM_PM_STYLE_NORMAL) { int magic1 = result.indexOf(MAGIC1); int magic2 = result.indexOf(MAGIC2); if (magic1 >= 0 && magic2 > magic1) { SpannableStringBuilder formatted = new SpannableStringBuilder(result); if (AM_PM_STYLE == AM_PM_STYLE_GONE) { formatted.delete(magic1, magic2+1); } else { if (AM_PM_STYLE == AM_PM_STYLE_SMALL) { CharacterStyle style = new RelativeSizeSpan(0.7f); formatted.setSpan(style, magic1, magic2, Spannable.SPAN_EXCLUSIVE_INCLUSIVE); } formatted.delete(magic2, magic2 + 1); formatted.delete(magic1, magic1 + 1); } return formatted; } } return result; }添加秒

你的问题是如何在这段代码中添加秒？

这段代码的作用是获取当前时间并以指定格式显示出来，但没有显示秒数。要添加秒数，可以修改格式字符串。在这里，我们可以在格式字符串的末尾添加一个”：ss“，表示显示秒数。修改后的代码如下：

private final CharSequence getSmallTime() {
    Context context = getContext();
    boolean is24 = DateFormat.is24HourFormat(context);
    LocaleData d = LocaleData.get(context.getResources().getConfiguration().locale);

    final char MAGIC1 = '\uEF00';
    final char MAGIC2 = '\uEF01';

    SimpleDateFormat sdf;
    String format = is24 ? d.timeFormat24 : d.timeFormat12;

    // Add seconds to the format string
    format += ":ss";

    if (!format.equals(mClockFormatString)) {
        /*
         * Search for an unquoted "a" in the format string, so we can
         * add dummy characters around it to let us find it again after
         * formatting and change its size.
         */
        if (AM_PM_STYLE != AM_PM_STYLE_NORMAL) {
            int a = -1;
            boolean quoted = false;
            for (int i = 0; i < format.length(); i++) {
                char c = format.charAt(i);
                if (c == '\'') {
                    quoted = !quoted;
                }
                if (!quoted && c == 'a') {
                    a = i;
                    break;
                }
            }
            if (a >= 0) {
                // Move a back so any whitespace before AM/PM is also in the alternate size.
                final int b = a;
                while (a > 0 && Character.isWhitespace(format.charAt(a-1))) {
                    a--;
                }
                format = format.substring(0, a) + MAGIC1 + format.substring(a, b) + "a" + MAGIC2 + format.substring(b + 1);
            }
        }
        mClockFormat = sdf = new SimpleDateFormat(format);
        mClockFormatString = format;
    } else {
        sdf = mClockFormat;
    }

    String result = sdf.format(mCalendar.getTime());

    if (AM_PM_STYLE != AM_PM_STYLE_NORMAL) {
        int magic1 = result.indexOf(MAGIC1);
        int magic2 = result.indexOf(MAGIC2);
        if (magic1 >= 0 && magic2 > magic1) {
            SpannableStringBuilder formatted = new SpannableStringBuilder(result);
            if (AM_PM_STYLE == AM_PM_STYLE_GONE) {
                formatted.delete(magic1, magic2+1);
            } else {
                if (AM_PM_STYLE == AM_PM_STYLE_SMALL) {
                    CharacterStyle style = new RelativeSizeSpan(0.7f);
                    formatted.setSpan(style, magic1, magic2, Spannable.SPAN_EXCLUSIVE_INCLUSIVE);
                }
                formatted.delete(magic2, magic2 + 1);
                formatted.delete(magic1, magic1 + 1);
            }
            return formatted;
        }
    }
    return result;
}

在修改后的代码中，我们在格式字符串的末尾添加了一个冒号和“ss”，表示显示秒数。然后，我们将修改后的格式字符串传递给SimpleDateFormat对象，以便格式化当前时间。最后，我们返回格式化后的时间字符串，它包含了秒数。