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Edit File: accept.js

// Accept a value from a file input based on a required mimetype
$.validator.addMethod( "accept", function( value, element, param ) {

// Split mime on commas in case we have multiple types we can accept
	var typeParam = typeof param === "string" ? param.replace( /\s/g, "" ) : "image/*",
		optionalValue = this.optional( element ),
		i, file, regex;

// Element is optional
	if ( optionalValue ) {
		return optionalValue;
	}

if ( $( element ).attr( "type" ) === "file" ) {

// Escape string to be used in the regex
		// see: https://stackoverflow.com/questions/3446170/escape-string-for-use-in-javascript-regex
		// Escape also "/*" as "/.*" as a wildcard
		typeParam = typeParam
				.replace( /[\-\[\]\/\{\}\+\?\.\\\^\$\|]/g, "\\$&" )
				.replace( /,/g, "|" )
				.replace( /\/\*/g, "/.*" );

// Check if the element has a FileList before checking each file
		if ( element.files && element.files.length ) {
			regex = new RegExp( ".?(" + typeParam + ")$", "i" );
			for ( i = 0; i < element.files.length; i++ ) {
				file = element.files[ i ];

// Grab the mimetype from the loaded file, verify it matches
				if ( !file.type.match( regex ) ) {
					return false;
				}
			}
		}
	}

// Either return true because we've validated each file, or because the
	// browser does not support element.files and the FileList feature
	return true;
}, $.validator.format( "Please enter a value with a valid mimetype." ) );