These expressions are often used interchangeably, but they do have different meanings.
这些表达法经常可以互换使用，但它们的确有不同的含义。
Do not use these annoying expressions!
不要用此类冒犯的表达。
Whether you need to validate form input or decompose content, regular expressions can do the trick.
无论您是需要验证表单输入，还是需要分解内容，使用正则表达式都非常有用。
I don't enjoy films because the characters' expressions make no sense and I don't find verbal humour funny, though I do like slapstick.
我不喜欢看电影，因为我看不懂人物的表情，也不能欣赏对话里的幽默。不过我喜欢看逗乐的形体表演。
Again, however, this procedure also demonstrates that there are multiple ways to do the same task, and sometimes regular expressions aren't always the best option.
然而，此过程也再次说明执行同一任务有多种方法，而且有时正则表达式并非总是最佳选择。
And there are others of which the strongest expressions are upon many occasions extremely graceful, even though the passions themselves do not, perhaps, arise so necessarily.
还有些激情，在很多场合下强烈地表达出来反而是非常得体合适的，尽管激情本身可能未必非常明显地表现出来。
These expressions can be used to quickly transform the current message, construct new messages and do content based routing.
我们可以使用这些表达式快速转换当前的消息、构造新的消息以及进行基于内容的路由。
Well, recent research published in the journal Nature Methods shows that mice show the facial expressions of pain just like humans do.
最近发表在《自然方法》杂志上的一项研究表明，老鼠也能像人类一样，表现出疼痛的表情。
Determining if a string matches a pattern is the simplest use of regular expressions and, as you see in Figure 1, it's, easy to do.
确定字符串是否与模式匹配是对正则表达式的最简单应用，如图1所示，而且易于操作。
To do that a person has to hold their breath. If your subject if holding her breath she cannot emote and create natural expressions.
如果总是让模特屏住呼吸的话，她是无法表现出自然的表情的。
Now what I'd like to do is go a little bit further and just look at expressions for the chemical potential and the free energies.
现在我想，更进一步，看看化学势，和自由能的表达式。
Therefore, the next task is to provide some kind of graphical interface in XHTML and PHP, which you can do by adding useful forms to generate powerful Scilab expressions.
因而，下一个任务是用XHTML和PHP提供某种图形界面，为了实现这个目的，可以添加有用的表单来生成功能强大的scilab表达式。
I'll show you a few quick XQuery expressions to give you a flavor of what XQuery can do, and then move on to the screen-scraping examples.
然后我们将介绍一些快速的XQuery表达式，让您对XQuery能够做什么形成一种认识，最后我们将再转到屏幕搜集的示例上。
Using powerful tools like sed and Perl, and the magic of regular expressions, you can easily do complex text processing tasks directly on the UNIX command line.
使用像sed和Perl这样功能强大的工具，以及神奇的正则表达式，您可以直接通过UNIX命令行轻松地完成复杂的文本处理任务。
To do this task, TXT files containing XPath expressions are used to mark the positions of XML configurations to be replaced.
要完成这个任务，要用包含XPath表达式的TXT文件来标记要被替代的XML配置的位置。
Next, the rule USES the ASTHelper.satisfy method to filter expressions from the list that do not meet a given criteria.
接下来，该规则使用ASTHelper. satisfy方法从满足给定标准的列表中筛选表达式。
Although FLWOR expressions are powerful and used in many queries, you can do many things without having to resort to them.
尽管FL WOER表达式功能强大、用途广泛，但不使用它们也可以完成许多任务。
Listing 5 USES both Ruby code and expressions. Notice the text in the body of the do loop.
清单5使用了Ruby代码和表达式。
You can certainly do much more with traversal expressions. For example, to retrieve all dates for resources in the month of March, you could write.
当然您可以使用遍历表达式做更多的事情。
If you do not define the expressions, it will be marked with an error.
如果您不定义表达式，则它将标记为错误。
Granted, such expressions don't always indicate self-doubt, but we would do well to check it out, so we can be sure.
就算这些表述并不总是自我怀疑的表现，但我们最好仔细核对一下，这样就能确定了。
What about your culture? Do you have any idioms or expressions about salt? In the comments section, share a story of salt from your culture.
那么你们的文化呢？你是否知道任何关于盐的习语或表达？在评论部分分享你们文化中关于盐的故事。
Being able to match varying sets of characters is the first thing regular expressions can do that isn't already possible with the methods available on strings.
正则表达式第一件能做的事是能够匹配不定长的字符集，而这是其它能作用在字符串上的方法所不能做到的。
Some relational database management systems (RDBMSs), such as Sybase, do not support table expressions in the FROM clause.
有些关系数据库管理系统(RDBMS)，例如sybase，不支持在from子句中使用表表达式。
However, for regular expressions that are rarely used, do not use Compiled as it causes increased startup costs and memory overhead.
然而，对于很少使用的正则表达式，则不要使用Compiled，否则会增加启动成本和内存开销。
Perl 6 grammars and regular expressions allow non-grouping matches, which do not save their result.
Perl6语法和正则表达式允许非分组匹配，不保存它们的结果。
We do not normally hold some facial expressions for long periods and natural expressions (notably smiles) have definable durations, typically between about half a second and four seconds.
正常情况下，我们无法长时间保持面部表情，而且自然的表情(尤其是笑脸)有规定的时间，一般为0.5 -4秒。
There are other interesting features in the Perl 6 regular expressions and grammars, which Perl 5 and p: : RD do not offer.
在Perl6正则表达式和语法中，有Perl5和P：RD所没有提供的其他有趣特性。
Some data sources, such as DB2 for z/OS and OS/390, do not allow expressions as a part of GROUP BY items.
有些数据源，例如DB2for z/OS和 OS/390，不允许表达式作为GROUP BY 子句的一部分。
Never use such expressions as “I can’t afford it” or “I can’t do this.”
永远不要使用下列用语：“我负担不起这个”或“我没有能力做到那个”。
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