In all other cases where we cannot find the beginning of a tag, we return the empty string.
在无法找到标签开头的其他所有情况下，我们返回一个空字符串。
You might be asking why the \W+ is necessary: \b is the empty string at the beginning or end of a word.
您可能会提出疑问，为什么 \W+是必需的：\b 是位于单词开头或结尾的空字符串。
This is different from using the empty string, which indicates that the property exists but has no value.
这与使用空字符串不同，空字符串表示属性存在但是没有值。
That was possible because we were using a default exchange, which is identified by the empty string ("").
那很有可能我们是在用默认的交换器，就是用空字符串定义的那个啦。
This both says I'm going to accept a parameter called tracegroups, and makes its default value the empty string.
引号中的两个字段表明，我将要接受名为tracegroups 的参数，并且它的缺省值为空字符串。
If the schema is NULL or the empty string, the procedure restores the schema to the name from where it was backed up.
如果模式是NULL或空字符串，那么这个过程采用备份时的模式名进行恢复。
Recursively, a word is reducible if any of its children are reducible. As a base case, you can consider the empty string reducible.
只要一个单词的孩子还可以缩减，那这个单词本身就亏缩减。你可以认为空字符串是可以缩减的，这样来作为一个基准条件。
The current design makes it hard to distinguish between an attribute whose value is the empty string and one that isn't present at all.
当前设计很难区分值为空字符串的属性和值根本不存在的属性。
The call to the preg_replace() function replaces the dollar sign, any whitespace, and every comma with the empty string, yielding what's supposed to be an integer.
调用 preg_replace()函数将用空字符串替换美元符号、所有空格和每个逗号，生成认为是整数的内容。
Note that I have to check that the attribute is actually present, since when it's absent the contains test would return true (the empty string is contained in all strings).
我必须检查这个属性实际上是否出现，因为当没有这个属性时，contains测试将返回true(所有字符串都包含空字符串)。
Bundle-Version: a version of the form major.minor.micro.qualifier where the first three elements are numeric (defaulting to 0) and qualifier is textual (defaulting to the empty string).
Bundle - Version： major . minor . micro .qualifier形式的版本号，前三个元素是数字(缺省是0)，qualifier则是文本(缺省是空字符串)。
Select "title" in the table, and in the property grid change "NullValue" to "(empty)" - that is, treat the title as the empty string whenever no data exists for it, instead of throwing an exception.
在Datatable中选中“title”，在属性栏里将“NullValue”的值更改为“(Empty)”-这样做是为了在没有与“title”对应的数据时，把title做为一个空字符串来对待，以此替换抛出异常。
If the index of the current letter is equal to the length of the string, this variable is an empty string.
如果当前字母的下标和字符串的长度相等，那么这个变量是一个空字符串。
Both of these methods return an empty string if the attribute doesn't exist.
如果属性不存在，那么这两种方法都将返回空字符串。
However, elements of type string do not appear as mandatory in the form because the schema accepts an empty value as valid input for a string.
但是，由于模式接受空值作为字符串的有效输入，因此，在表单中字符串类型的元素并不显示为必填的。
If the supplied string does not contain a prefix, the namespace URI is an empty string.
如果提供的字符串并不包含前缀，则对应的名称空间uri将为一个空字符串。
If the string can't be empty or must be in a specific format, check for the format and throw an exception.
如果字符串不能为空或者必须为特定格式，请检查格式并抛出异常。
If the CMD parameter is add, an empty field is added at the end of the returned HTML string.
如果cmd参数为add，则在返回的HTML字符串的尾部添加一个空字段。
The skip variable was set to "(empty string), so all input, including Spaces, goes to the token directive."
skip变量设置为' '(空字符串)，所以所有输入(包括空格)都转至标志伪指令。
It returns a null if no match is found, or if the source string is null or empty.
如果没有发现匹配项或源字符串是null或空，则返回null。
If he just presses Enter, the read_line function will return an empty string, and such input is taken as an indication that the user wants to go on.
如果他只是按下了回车，read_line函数将返回一个空字符串，这样的输入会被认为是一种用户希望继续进行检索的暗示。
The previous parameter starts off with the initial value, or, in this case an empty string.
previous参数有一个初始值，在本例中，是一个空白字符串。
Bool empty : If the path object contains an empty string for example, path path1 " ", then this routine returns True or False.
boolempty：如果path对象包含空字符串(例如pathpath1(“ ”))，则此例程将返回True。
I can now fill the new empty class with attributes such as string and number types (representing the elements of the character), as well as functions common to this class.
我现在能向这新的空类填充属性，诸如字符串和数字类型(代表了角色的成分)，以及这个类中常用的函数。
If you omit this parameter or pass an empty string, the default matching modes are used.
如果您忽略了此参数或传递空字符串，则将使用默认匹配模式。
The rest of the expression is used to see if the value (without leading or trailing blanks) is an empty string.
表达式的其余部分用来检查值(去掉头尾的空格之后)是否是空字符串。
That is, the token is to be replaced with a value associated with the name of the variable; or, if no value as been defined, with either the default value or an empty string.
也就是说，该标记将会被与变量名关联的值替换；如果没有定义关联值，那么就会替换为默认值或空字符串。
Some of the typical string-related checks include verifying that an empty string has 0 size and accessing out of index from the string results in an error message/exception.
与字符串相关的典型检查包括检查空字符串的长度是否为 0以及访问范围超出索引是否导致错误消息/异常。
If this property is omitted or defined as an empty string, the schema is not used for constructing the parameter's URI.
如果省略该属性或将其定义为空串，那么模式将不能用来构造参数的URI。
Also, the test in Line 13 will fail to detect an error because the result of the call will not be an empty string.
第13行中的检查也无法探测到错误，因为调用的结果不是空字符串。
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