[英]Javascript regex - getting function name from string
I am trying to get a function name from a string in javascript. 我试图从javascript中的字符串获取函数名称。
Let's say I have this string: 假设我有以下字符串:
function multiply($number) {
return ($number * 2);
}
I am using the following regex in javascript: 我在javascript中使用以下正则表达式:
/([a-zA-Z_{1}][a-zA-Z0-9_]+)\(/g
However, what is selected is multiply(
. This is wrong. What I want is the word multiply
without the the (
, though the regex should keep in mind that the function name must be attached an (
. 但是,选择的是
multiply(
。这是错误的。我想要的是不包含(
的单词) multiply
,尽管正则表达式应记住,函数名称必须附加一个(
。
I can't get this done. 我做不到。 How can I make the proper regex for this?
我该如何为此制作合适的正则表达式? I know that this is not something I really should do and that it is quite error sensitive, but I still wanna try to make this work.
我知道这不是我真正应该做的事情,并且它对错误非常敏感,但是我仍然想尝试使这项工作生效。
Just replace last \\)
with (?=\\()
只需将最后一个
\\)
替换为(?=\\()
`function multiply($number) {
return ($number * 2);
}`.match(/([a-zA-Z_{1}][a-zA-Z0-9_]+)(?=\()/g) // ["multiply"]
You can use: 您可以使用:
var name = functionString.match(/function(.*?)\(/)[1].trim();
Get anything between function
and the first (
(using a non-gredy quantifier *?
), then get the value of the group [1]
. And finally, trim
to remove surrounding spaces. 获取
function
和第一个function
之间的任何function
(
(使用非灰色量词*?
),然后获取组[1]
的值。最后, trim
以除去周围的空间。
Example: 例:
var functionString = "function dollar$$$AreAllowedToo () { }"; var name = functionString.match(/function(.*?)\\(/)[1].trim(); console.log(name);
Notes: 笔记:
function
and (
, or a new line too. But this really depends on how you intend to use this regex. function
和(
之间的注释的可能性,或者也要换行。但这实际上取决于您打算如何使用此正则表达式。 take for examlpe: 举例:
function /*this is a tricky comment*/ functionName // another one
(param1, param2) {
}
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