Javascript 正则表达式中 /gi 的含义是什么？
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What's the meaning of /gi in a regex?
提问by batman
I see an line in my JavaScript code like this:
我在 JavaScript 代码中看到这样一行：
var regex = /[^\w\s]/gi;
What's the meaning of this /giin the regex?
这/gi在正则表达式中是什么意思？
Other part I can understand as it accepts a group of word and spaces, but not /gi.
其他部分我可以理解，因为它接受一组单词和空格，但不接受/gi.
回答by vks
g modifier: global. All matches (don't return on first match)
i modifier: insensitive. Case insensitive match (ignores case of [a-zA-Z])
In your case though iis immaterial as you dont capture [a-zA-Z].
在您的情况下，虽然i不重要，因为您没有捕获[a-zA-Z].
For input like !@#$if gmodifier is not there regex will return first match !See here.
对于像!@#$ifg修饰符不存在这样的输入，正则表达式将返回第一个匹配项，!请参见此处。
If gis there it will return the whole or whatever it can match.See here
如果g在那里，它将返回整个或它可以匹配的任何内容。看这里
回答by elixenide
The beginning and ending /are called delimiters. They tell the interpreter where the regex begins and ends. Anything afterthe closing delimiter is called a "modifier," in this case gand i.
开头和结尾/称为分隔符。它们告诉解释器正则表达式的开始和结束位置。结束定界符之后的任何内容都称为“修饰符”，在本例中为g和i。
The gand imodifiers have these meanings:
在g与i改性剂具有以下含义：
g= global, match all instances of the pattern in a string, not just onei= case-insensitive (so, for example,/a/iwill match the string"a"or"A".
g= global，匹配字符串中模式的所有实例，而不仅仅是一个i= 不区分大小写（例如，/a/i将匹配字符串"a"或"A".
In the context you gave (/[^\w\s]/gi), the iis meaningless, because there are no case-specific portions of the regex.
在您提供 ( /[^\w\s]/gi)的上下文中， thei是没有意义的，因为正则表达式没有特定于大小写的部分。
