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Sizzle should have standard CSS2.1 compliant regular expression matching "identifiers" /via @diegoperini #60
'when will jQuery have standard CSS2.1 compliant regular expression matching "identifiers" ? Range \u00C0-\uFFFF is wrong !' - @diegoperini (https://twitter.com/#!/diegoperini/status/68236401879154688)
In CSS, identifiers (including element names, classes, and IDs in selectors) can contain only the characters [a-zA-Z0-9] and ISO 10646 characters U+00A0 and higher, plus the hyphen (-) and the underscore (_); they cannot start with a digit, two hyphens, or a hyphen followed by a digit. Identifiers can also contain escaped characters and any ISO 10646 character as a numeric code (see next item). For instance, the identifier "B&W?" may be written as "B&W?" or "B\26 W\3F".