Question

前段时间我做了一个REGEX模式，我不记得它的含义了。对我来说，这是一种只写语言：）

这是REGEX：

"(?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{8,10})$"

我需要用简单的英语知道这意味着什么。

Answer 1

(?!^[0-9]*$)

不匹配数字，

(?!^[a-zA-Z]*$)

不匹配字母，

^([a-zA-Z0-9]{8,10})$

匹配字母和数字长度为8到10个字符。

Answer 2

Perl（以及Python相应地）对(?!...)部分说：

零宽度负前瞻断言。例如，/foo(?!bar)/匹配任何未出现'bar'的'foo'。但请注意，前瞻和后瞻不是一回事。你不能用它来做后卫。

这意味着，

(?!^[0-9]*$)

表示：不匹配，如果字符串包含仅数字。（^：行/字符串的开头，$：结束行/字符串）另一个相应的。

您的正则表达式匹配任何字符串，其中包含两个数字和字母，但不仅包含其中一个字符串。

干杯，

更新：对于将来的RegExp定制，请查看(?#...)模式。它允许您在正则表达式中嵌入注释。还有一个修饰符，re.X，但我不太喜欢这个。这是你的选择。

Answer 3

RegexBuddy说以下（！？！）：

(?!^[0-9]*$)(?!^[a-zA-Z]*$)^([a-zA-Z0-9]{8,10})$

Options: ^ and $ match at line breaks

Assert that it is impossible to match the regex below starting at this position (negative lookahead) «(?!^[0-9]*$)»
   Assert position at the beginning of a line (at beginning of the string or after a line break character) «^»
   Match a single character in the range between “0” and “9” «[0-9]*»
      Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
   Assert position at the end of a line (at the end of the string or before a line break character) «$»
Assert that it is impossible to match the regex below starting at this position (negative lookahead) «(?!^[a-zA-Z]*$)»
   Assert position at the beginning of a line (at beginning of the string or after a line break character) «^»
   Match a single character present in the list below «[a-zA-Z]*»
      Between zero and unlimited times, as many times as possible, giving back as needed (greedy) «*»
      A character in the range between “a” and “z” «a-z»
      A character in the range between “A” and “Z” «A-Z»
   Assert position at the end of a line (at the end of the string or before a line break character) «$»
Assert position at the beginning of a line (at beginning of the string or after a line break character) «^»
Match the regular expression below and capture its match into backreference number 1 «([a-zA-Z0-9]{8,10})»
   Match a single character present in the list below «[a-zA-Z0-9]{8,10}»
      Between 8 and 10 times, as many times as possible, giving back as needed (greedy) «{8,10}»
      A character in the range between “a” and “z” «a-z»
      A character in the range between “A” and “Z” «A-Z»
      A character in the range between “0” and “9” «0-9»
Assert position at the end of a line (at the end of the string or before a line break character) «$»

Answer 4

使用类似expresso的内容进行分析。

解释这个特殊的REGEX

4 个答案: