[英]javascript regex for extracting filename from Content-Disposition header
Content-disposition header contains filename which can be easily extracted, but sometimes it contains double quotes, sometimes no quotes and there are probably some other variants too. Content-disposition 标头包含可以轻松提取的文件名,但有时它包含双引号,有时不包含引号,并且可能还有其他一些变体。 Can someone write a regex which works in all the cases.
有人可以编写一个适用于所有情况的正则表达式。
Content-Disposition: attachment; filename=content.txt
Here are some of the possible target strings:以下是一些可能的目标字符串:
attachment; filename=content.txt
attachment; filename*=UTF-8''filename.txt
attachment; filename="EURO rates"; filename*=utf-8''%e2%82%ac%20rates
attachment; filename="omáèka.jpg"
and some other combinations might also be there
You could try something in this spirit: 你可以尝试这种精神:
filename[^;=\n]*=((['"]).*?\2|[^;\n]*)
filename # match filename, followed by
[^;=\n]* # anything but a ;, a = or a newline
=
( # first capturing group
(['"]) # either single or double quote, put it in capturing group 2
.*? # anything up until the first...
\2 # matching quote (single if we found single, double if we find double)
| # OR
[^;\n]* # anything but a ; or a newline
)
Your filename is in the first capturing group: http://regex101.com/r/hJ7tS6 您的文件名在第一个捕获组中: http : //regex101.com/r/hJ7tS6
Slightly modified to match my use case (strips all quotes and UTF tags) 略微修改以匹配我的用例(删除所有引号和UTF标记)
filename\\*?=['"]?(?:UTF-\\d['"]*)?([^;\\r\\n"']*)['"]?;?
https://regex101.com/r/UhCzyI/3 https://regex101.com/r/UhCzyI/3
/filename[^;=\n]*=(?:(\\?['"])(.*?)\1|(?:[^\s]+'.*?')?([^;\n]*))/i
https://regex101.com/r/hJ7tS6/51 https://regex101.com/r/hJ7tS6/51
Edit : You can also use this parser: https://github.com/Rob--W/open-in-browser/blob/master/extension/content-disposition.js 编辑 :您也可以使用此解析器: https : //github.com/Rob--W/open-in-browser/blob/master/extension/content-disposition.js
Disclaimer: the following answer only works with PCRE (eg Python / PHP), if you have to use javascript, use Robin's answer. 免责声明:以下答案仅适用于PCRE (例如Python / PHP),如果您必须使用javascript,请使用Robin的答案。
This modified version of Robin's regex strips the quotes: 这个修改后的Robin正则表达式删除了引号:
filename[^;\n=]*=(['\"])*(.*)(?(1)\1|)
filename # match filename, followed by
[^;=\n]* # anything but a ;, a = or a newline
=
(['"])* # either single or double quote, put it in capturing group 1
(?:utf-8\'\')? # removes the utf-8 part from the match
(.*) # second capturing group, will contain the filename
(?(1)\1|) # if clause: if first capturing group is not empty,
# match it again (the quotes), else match nothing
https://regex101.com/r/hJ7tS6/28 https://regex101.com/r/hJ7tS6/28
The filename is in the second capturing group. 文件名位于第二个捕获组中。
Here is my regular expression. 这是我的正则表达式。 It works on Javascript.
它适用于Javascript。
filename\*?=((['"])[\s\S]*?\2|[^;\n]*)
I used this in my project. 我在我的项目中使用了这个。
filename[^;\n]*=(UTF-\d['"]*)?((['"]).*?[.]$\2|[^;\n]*)?
I have upgraded Robin's solution to do two more things: 我已经升级了Robin的解决方案,还做了两件事:
Capture filename even if it has escaped double quotes. 即使文件已转义双引号,也要捕获文件名。
Capture UTF-8'' part as a separate group. 将UTF-8''部分捕获为一个单独的组。
This is an ECMAScript solution. 这是一个ECMAScript解决方案。
https://regex101.com/r/7Csdp4/3/ https://regex101.com/r/7Csdp4/3/
I made a regex that finds these names using a group filename
我制作了一个使用组
filename
查找这些名称的正则表达式
/(?<=filename(?:=|\*=(?:[\w\-]+'')))["']?(?<filename>[^"';\n]+)["']?/g
const regex = /(?<=filename(?:=|\\*=(?:[\\w\\-]+'')))["']?(?<filename>[^"';\\n]+)["']?/g const filenames = ` attachment; filename=content.txt attachment; filename*=UTF-8''filename.txt attachment; filename="EURO rates"; filename*=utf-8''%e2%82%ac%20rates attachment; filename="omáèka.jpg" ` function logMatches(){ const array = new Array filenames.split("\\n").forEach(line => { if(!line.trim()) return const matches = line.matchAll(regex) const groups = Array.from(matches).map(match => match?.groups?.filename) array.push(groups.length === 1 ? groups[0] : groups) }) console.log(array) } logMatches()
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