Sublime Text change case of back-reference during regex find and replace

Sublime regex replace

When performing a regex find-and-replace in Sublime Text 2, the following modifiers may be used to change the case of a backreference during the replacement step:

\l : first character to lower case
\u : first character to upper case
\L : start of lower case conversion
\U : start of upper case conversion
\E : end lower/upper case conversion

(Conversion only applies to alpha-characters)

Example

Given an HTML file containing the following class attributes:
class="item-title"
class="item-description"
class="item-comment"
Your task is to remove the hyphen from the class name and replace it with a camel-cased version of the class name like so:
class="itemTitle"
class="itemDescription"
class="itemComment"

One solution is to perform the following regex find-and-replace:
Find What item-(.)
Replace With: item\u\1

Source: http://philquinn.co.uk/sublime-text-2-convert-regex-backreference-case/