regex - 这是什么意思？使用表达式匹配什么字符串？

Question

我检查了嘶嘶声代码并看到了一个定义。

var chunker = /((?:\((?:\([^()]+\)|[^()]+)+\)|\[(?:\[[^\[\]]*\]|['"][^'"]*['"]|[^\[\]'"]+)+\]|\\.|[^ >+~,(\[\\]+)+|[>+~])(\s*,\s*)?((?:.|\r|\n)*)/g,

我想知道如何找出这个正则表达式匹配的字符串？

Answer 1

见 this article .多行正则表达式中的解释:

var chunker = /
 (
  (?:
   # One or more sets of parentheses that contain a string, or another set of 
   parentheses with a string
   \(
   (?:
    \([^()]+\)
    |
    [^()]+
   )+
   \)
   |
   # Or one or more sets of brackets that contain a string, or another set of
   brackets with a string
   \[
   (?:
    \[[^\[\]]*\]
    |
    ['"][^'"]*['"]
    |
    [^\[\]'"]+
   )+
   \]
   |
   # Or a backslash followed by any character
   \\.
   |
   # Or one or more of any except these characters: > +~,([\
   [^ >+~,(\[\\]+
  )+
  # or any one of these characters: >+~
  |
  [>+~]
 )
 # followed by zero or one commas, which may be surrounded by whitespace
 (\s*,\s*)?
 # followed by zero or more of anything, including line endings
 ((?:.|\r|\n)*)
/g

此表达式包含三个匹配组:“验证”选择器表达式、最终逗号以及之后的所有内容。它将不断地在选择器上被调用以将其分成几部分，参见 Sizzle构造器了解详情。