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(1)最简单的正则表达式是普通字符事，只能西配自身。

(2)'[pjc]ython'可以四配'python',jython',cython'

(3)[a-zA-Z0-9]'可以西配一个任意大小写字用或数字。(4)'[^abe]可以一个四配任意除'a'、'b'、'c'之外的字符。

(5)'pythonlperl'或'p(ython|erl)'都可以匹配'python'或'perl'。

(6)r'(http://)? (wwwl.)? python\.org'只他 匹配http://www.python.org"http://python.org'、www,python.org和'python.org’.

(7)'*http'只能四配所有以'http‘开头的字符串。

(8)(pattern)*:允许模式重复0次或多次。

(9)(pattern)+:允许模式重复一次或多次。

(10)(pattern)(m,n}:允许模式重复m~n次，注意逗号后面不要有空格。

(11)'(alb)*c':匹配多个(包含0个)a或b,后面紧跟一个字母 c。

(12)’abl1,)':等价于'ab+',匹配以字母a开头后面紧跟一个或多个字母b的字符串。

(13)‘^[a-zA-Z]{1)([a-zA-Z0-9,_])(4,19}#39;:匹配长度为5~20的字符串，必须以字母开头并且后面可带数字、字母、“_”“.”的字符串。

(14)'^(\w)(6,20}#39;:匹配长度为6~20的字符串，可以包含字母、数字、下画线。

(15) '^\d{1,3)\.\d(1.3)\.\d(1,3)\\d{1,3)#39;:检查给定字符串是否为合法

(1) The simplest regular expression is a common character thing, which can only match itself in the west.

(2) '[pjc] ython' can be quadruple with 'python', jython ', cython'

(3) [A-zA-Z0-9]'can be paired with a number or number.(4) '[^ abe] can be matched with four characters other than' a ',' b ',' c '.

(5) Either 'pythonlperl' or 'p (ython | erl)' can match 'python' or 'perl'.

(6)r'(http://)?(wwwl.)?python\. The org 'only he matches the http://www.python.org"http://python.org', www,python.org and the 'python.org'.

(7) '* http' can only match all strings beginning with 'http'.

(8) (pattern) *: Allow the mode to repeat 0 or more times.

(9) (pattern) +: Allow the mode to be repeated once or more times.

(10) (pattern) (m, n}: allow the mode to repeat m~n times, note that there is no space behind the comma.

(11) '(alb) * c': Matches multiple (including 0) a or b, followed by one letter c.

(12) 'abl1,)': Equivalent to 'ab +', matching a string beginning with a letter b or more followed by a letter a.

(13) '^ [a-zA-Z] {1) ([a-zA-Z0-9, _]) (4,19} #39;: A matching string of 5 to 20 must start with a letter followed by numbers, letters, "_"" The string of.

(14) '^ (\ w) (6,20} #39;: Matches length 6 to 20 strings, can include letters, numbers, lines.

(15) '^\d{1,3)\. \d(1.3)\. \ d (1,3) \ \ d {1,3) $ ': Check if a given string is legal

使用时要注意的是，正则表达式只是进行形式上的检查，并不保证内容一定正确。例如上面的例子中，正则表达式'^\d{1,3}\.\d{1,3}\.\d{1.3)\.\d(1,3)$可以检查字符串是否为IP地址，字符串888.888.888.888这样的也能通过检查，但实际上并不是有效的IP地址。同样的道理，,正则表达式'^\d{18}|\d(15)#39;也只负责检查字符串是否为18位或15位数字,并不保证一定是合法的身份证号。

It should be noted that regular expressions are only formal checks and do not guarantee that the content is correct. For example, in the example above, the regular expression'^ \ d {1,3} \. \d{1,3}\. \d{1.3)\. \ d (1,3) $ can check if the string is an IP address, and the string 888.888.888.88.888 also passes it, but it is not actually a valid IP address. In the same way, the regular expression '^ \ d {18} | \ d (15) #39; is also responsible for checking only whether the string is in 18 or 15 digits, and does not necessarily guarantee a legitimate ID number.

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