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A while ago I published an article explaining the utter awesomeness of extending jQuery’s filter selectors. Building on that here’s something new; a regular expression selector. jQuery’s current attribute selectors (CSS3) do allow basic regex notation but no where near as much as this:
jQuery.expr[‘:‘].regex = function(elem, index, match) {
var matchParams = match[3].split(‘,‘),
validLabels = /^(data|css):/,
attr = {
method: matchParams[0].match(validLabels) ?
matchParams[0].split(‘:‘)[0] : ‘attr‘,
property: matchParams.shift().replace(validLabels,‘‘)
},
regexFlags = ‘ig‘,
regex = new RegExp(matchParams.join(‘‘).replace(/^\s+|\s+$/g,‘‘), regexFlags);
return regex.test(jQuery(elem)[attr.method](attr.property));
}
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It’s pretty simple to use, you need to pass an attribute and a regular expression to match against. The regular expression must be in non-literal notation; so replace all backslashes with two backslashes (e.g. ^\w+$ -> ^\\w+$).
// Select all elements with an ID starting a vowel: $(‘:regex(id,^[aeiou])‘); // Select all DIVs with classes that contain numbers: $(‘div:regex(class,[0-9])‘); // Select all SCRIPT tags with a SRC containing jQuery: $(‘script:regex(src,jQuery)‘); // Yes, I know the last example could be achieved with // CSS3 attribute selectors; it‘s just an example... |
Note: All searches are case insensitive; you can change this by removing the ‘i’ flag in the plugin.
This plugin also allows you to query CSS styles with regular expressions, for example:
// Select all elements with a width between 100 and 300:
$(‘:regex(css:width, ^[1-3]\\d{2}px$)‘);
// Select all NON block-level DIVs:
$(‘div:not(:regex(css:display, ^block$))‘);
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Additionally it allows you to query data strings added to elements via jQuery’s ‘data’ method:
// Add data property to all images (just an example);
$(‘img‘).each(function(){
$(this).data(‘extension‘, $(this)[0].src.match(/.(.{1,4})$/)[1]);
});
// Select all images with PNG or JPG extensions:
$(‘img:regex(data:extension, png|jpg)‘);
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Have fun!
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原文地址：http://www.cnblogs.com/eYeah/p/5761493.html
