产生一个字符表达式组成的新的列。
从左到右读入中缀表达式，每次一个字符。
Read the infix expression from left to right, one character at a time.
在这个特别的规则表达式中，出现了' [[：space：]] '字符类。
In this particular regular expression, we encounter the '[[: space:]]' character class.
下一个括弧括起来的子表达式和上一个实例非常相似：要么匹配不包括尖括号的所有字符 ?
The next parenthesized sub-expression is very similar to the one above.
在本例中为一个字符串表达式。
单击画布，将字符串表达式连接到日志表达式。
Click the canvas, and connect the string expression to the log expression.
您针对这个对象运行一个正则表达式，提取用户代理字符串。
You run a regular expression against it to extract the user agent string.
但是掩码字符串不如正则表达式那么灵活。
But mask strings are not as flexible as regular expressions.
例如，正则表达式abc将与字符串abc匹配，但不与def匹配。
For example, the regular expression ABC will match the string ABC but not DEF.
清单8演示了如何使用正则表达式检查JSON字符串。
Listing 8 demonstrates how to check a JSON string with a regular expression.
简而言之，正则表达式描述字符串模式。
In a nutshell, a regular expression describes a string pattern.
正则表达式是描述一组字符串的字符模式。
A regular expression is a pattern of characters that describes a set of strings.
在规则表达式中，方括号只表示“查找与方括号中任何字符的匹配字符”。
In regular expressions, square brackets just mean "match any character in the brackets."
部分名称是在定义XPath表达式时必须输入的字符串。
The part name is the string you have to enter when defining your XPath expression.
基于搜索字符串寻找结果或者规则表达式。
Search for a finding based on a search string, or a regular expression.
source：正则表达式所匹配的输入字符串。
Source: the input string the regular expression is matched against.
只需要把regex放在中括号里，然后放在一个字符串的前面就可以创建一个正则表达式了。
Just put the word regex in brackets ([]) before a string to create a regular expression.
在这个例子中的每个正规表达式都是测试字符串的子串之一。
Each regular expression in this example is a substring of one of the test strings.
从左到右读入中缀表达式，每次一个字符。
Read the infix expression from left to right , one character at a time.
大多数特殊字符在中括号表达式内出现时都会失去它们的意义。
Most special characters lose their meaning when they occur inside a bracket expression.
正则表达式-如何与至少一个特殊字符的字符串集的地方？
REGEX - How to match set of string with at least one special character anywhere?
我可以做一个正则表达式匹配所有字符到；除\；？
正则表达式语言是世界上最流行的字符串匹配语言。
Regular expression is the most popular string matching language in the world.
所有字符都是普通的，表达式是字面字符串。
All characters are ordinary, the expression is a literal string.
正则表达式匹配空字符串？
如果没有找到匹配的正则表达式，使用常规字符串的结果。
If no regular expression_r matches are found, the result from the convention string search is used.
实现一个简易计算器，计算简单表达式字符串的值。
Implement a basic calculator to evaluate a simple expression string.
什么是正则表达式读取字符串？
还可以从替换字符串中引用子表达式。
You can also refer to a subexpression from within a replacement string.
还可以从替换字符串中引用子表达式。
You can also refer to a subexpression from within a replacement string.
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