CSS , , node JavaScript AZ (match(/^[a-z]+$/i) ( , ).
true, , - appears-english, CSS .appears-english { font-size: 120% }.
Update
, - ...
JavaScript
var divs = document.getElementsByTagName('div');
for (var i = 0, divsLength = divs.length; i < divsLength; i++) {
var div = divs[i];
if (div.firstChild.nodeValue.match(/^[a-z]+$/)) {
div.className += 'appears-english';
}
}
CSS
.appears-english {
font-size: 170%;
}
jsFiddle.
, , - , [a-z] \w.
, , , replace() span, appears-english .