javascript regex for extracting filename from Content-Disposition header

Javascript regex for extracting filename from Content-Disposition header

You can use a regular expression in JavaScript to extract the filename from the Content-Disposition header. Here's an example of how you can do it:

// Example Content-Disposition header const contentDispositionHeader = 'attachment; filename="example.txt"'; // Regular expression to extract filename const filenameRegex = /filename="(.+)"/; // Extract filename using regex const matches = filenameRegex.exec(contentDispositionHeader); const filename = matches && matches[1]; console.log(filename); // Output: example.txt

This regex filename="(.+)" looks for the string filename=", then captures any characters until it encounters the closing quote ". The filename is stored in the first capturing group, which you can access with matches[1].

Examples

  1. "JavaScript regex Content-Disposition filename extraction"

    • Description: This query suggests looking for a regular expression to extract the filename from the Content-Disposition header in JavaScript, commonly used in file downloads via HTTP responses.
    // Example: Regex to extract filename from Content-Disposition header const contentDispositionHeader = 'attachment; filename="example.txt"'; const filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/; const filename = contentDispositionHeader.match(filenameRegex)[1]; console.log(filename);

  2. "Regex for parsing Content-Disposition filename JavaScript"

    • Description: This search query implies seeking a regex pattern specifically designed to parse and extract filenames from Content-Disposition headers in JavaScript applications.
    // Example: Regex for parsing Content-Disposition header const contentDispositionHeader = 'attachment; filename="example.txt"'; const filenameRegex = /filename\*?=['"]?(?:UTF-\d['"]*)?([^;\r\n"']*)['"]?/; const filename = contentDispositionHeader.match(filenameRegex)[1]; console.log(filename);

  3. "Extract filename from Content-Disposition using regex"

    • Description: This query suggests a desire to extract filenames from Content-Disposition headers using a regular expression for various use cases like file downloads in web applications.
    // Example: Regex to extract filename from Content-Disposition header const contentDispositionHeader = 'attachment; filename="example.txt"'; const filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/; const filename = contentDispositionHeader.match(filenameRegex)[1]; console.log(filename);

  4. "JavaScript Content-Disposition regex filename capture"

    • Description: This search query indicates a need for a regex pattern in JavaScript that can reliably capture filenames from Content-Disposition headers, possibly for server-side processing.
    // Example: Regex to capture filename from Content-Disposition header const contentDispositionHeader = 'attachment; filename="example.txt"'; const filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/; const filename = contentDispositionHeader.match(filenameRegex)[1]; console.log(filename);

  5. "Content-Disposition filename regex JavaScript example"

    • Description: This query suggests looking for an example implementation of a regex pattern in JavaScript specifically tailored for extracting filenames from Content-Disposition headers.
    // Example: Regex pattern to extract filename from Content-Disposition header const contentDispositionHeader = 'attachment; filename="example.txt"'; const filenameRegex = /filename\*?=['"]?(?:UTF-\d['"]*)?([^;\r\n"']*)['"]?/; const filename = contentDispositionHeader.match(filenameRegex)[1]; console.log(filename);

  6. "Parsing Content-Disposition header for filename using regex"

    • Description: This query implies an interest in parsing Content-Disposition headers for filenames using a regex approach in JavaScript, which is a common requirement for handling file downloads.
    // Example: Regex to parse Content-Disposition header and extract filename const contentDispositionHeader = 'attachment; filename="example.txt"'; const filenameRegex = /filename\*?=['"]?(?:UTF-\d['"]*)?([^;\r\n"']*)['"]?/; const filename = contentDispositionHeader.match(filenameRegex)[1]; console.log(filename);

  7. "JavaScript regex to get filename from Content-Disposition header"

    • Description: This search query indicates a need for a JavaScript regex pattern to extract filenames specifically from Content-Disposition headers, commonly found in HTTP responses.
    // Example: Regex to get filename from Content-Disposition header const contentDispositionHeader = 'attachment; filename="example.txt"'; const filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/; const filename = contentDispositionHeader.match(filenameRegex)[1]; console.log(filename);

  8. "Extracting filename from Content-Disposition using regex JavaScript"

    • Description: This query suggests extracting filenames from Content-Disposition headers using regex in JavaScript, which is a common task when dealing with file downloads in web applications.
    // Example: Regex to extract filename from Content-Disposition header const contentDispositionHeader = 'attachment; filename="example.txt"'; const filenameRegex = /filename\*?=['"]?(?:UTF-\d['"]*)?([^;\r\n"']*)['"]?/; const filename = contentDispositionHeader.match(filenameRegex)[1]; console.log(filename);

  9. "JavaScript regex to parse Content-Disposition filename"

    • Description: This search query implies seeking a regex pattern in JavaScript to effectively parse and extract filenames from Content-Disposition headers, which is crucial for handling file downloads.
    // Example: Regex to parse Content-Disposition header and extract filename const contentDispositionHeader = 'attachment; filename="example.txt"'; const filenameRegex = /filename\*?=['"]?(?:UTF-\d['"]*)?([^;\r\n"']*)['"]?/; const filename = contentDispositionHeader.match(filenameRegex)[1]; console.log(filename);

  10. "JavaScript regex to extract filename from Content-Disposition header"

    • Description: This query indicates a need for a regex pattern in JavaScript to extract filenames specifically from Content-Disposition headers, typically encountered in file download scenarios.
    // Example: Regex to extract filename from Content-Disposition header const contentDispositionHeader = 'attachment; filename="example.txt"'; const filenameRegex = /filename[^;=\n]*=((['"]).*?\2|[^;\n]*)/; const filename = contentDispositionHeader.match(filenameRegex)[1]; console.log(filename);

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