Description:
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The preg documentation for setting the ungreedy modifier in the middle of a pattern is unclear on this page:

http://www.php.net/manual/en/pcre.pattern.modifiers.php

In the "U (PCRE_UNGREEDY)" section it says: 

"It [the ungreedy modifier] can also be set by a (?U) modifier setting within the pattern."

This is confusing.  Why is the "U" inside the parentheses?  Why are the parentheses even here?  As far as I can tell, neither the parentheses nor the U have anything to do with using "?" to make a particular quantifier ungreedy within a pattern.  Specifically, neither /,.*?U,/ nor /,.*(?U),/ seem to make the * ungreedy.

In my opinion, it would be more clear to say:

"The ungreedy modifier can also be applied to individual quantifiers within a pattern by placing a "?" after the quantifier. For example /,.*?,/ will ungreedily match characters between the commas."

(Aside: I admit that the effects of the "?" inside patterns is well documented on this page:

http://www.php.net/manual/en/pcre.pattern.syntax.php

But unfortunately the word "ungreedy", while it does appear on the page, does not appear near the section describing the ungreedy effects of "?".)

Many thanks.