英文:
Delete folder files starting with a word in nodejs
问题
我正在使用nodejs。嗨，我需要删除以某个单词开头的所有文件夹中的文件。我尝试了下面的代码，但没有成功：const deleteFile = (path, regex) => {fs.readdirSync(path).filter(f => regex.test(f)).map(f => fs.unlinkSync(path + f));};const starting_filename="name_to_delete";if (tenantInstance.companyLogoUrl) {const path = join(__dirname, "..", "..", "..", "public");const regex = /^${starting_filename}+/;deleteFile(path, new RegExp(regex));}
英文:
I am using nodejs.
Hi, I need to delete all files starting with a word in a folder.
I have tried the next code but no look:
const deleteFile = (path, regex) => {fs.readdirSync(path).filter(f => regex.test(f)).map(f => fs.unlinkSync(path + f));};const starting_filename="name_to_delete";if (tenantInstance.companyLogoUrl) {const path = join(__dirname, "..", "..", "..", "public");const regex = `/^${starting_filename}+/`;deleteFile(path, new RegExp(regex));}
答案1
得分: 1
斜杠是正则表达式字面量语法的一部分，在使用 new RegExp() 时不需要将它们包裹在字符串中——这将尝试匹配字面斜杠字符。
在正则表达式的末尾不需要使用 +。这会匹配 starting_filename 的最后一个字符的一个或多个。当你使用 test() 而不是 match() 时，这是多余的，因为匹配的达到程度无关紧要。
const regex = `^${starting_filename}`;
请注意，如果 starting_filename 包含任何在正则表达式中具有特殊含义的字符，它们需要进行转义。请参考 https://stackoverflow.com/questions/3115150/how-to-escape-regular-expression-special-characters-using-javascript
英文:
Slashes are part of the syntax of RegExp literals, you don't wrap them around the string when using new RegExp() -- that will try to match literal slash characters.
You don't need + at the end of the RegExp. That matches 1 or more of the last character of starting_filename. This is redundant when you're using test() rather than match(), since it doesn't matter how far the match reaches.
const regex = `^${starting_filename}`;
Note that this will not work if starting_filename contains any characters that have special meaning in a regular expression, they need to be escaped. See https://stackoverflow.com/questions/3115150/how-to-escape-regular-expression-special-characters-using-javascript
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