QRegExp documentation

[cic]

Hi, it must be an easy to solve problem i hope

what is the regular expression for the pattern:

G|xxxx - a capital letter | arbitrary word

I used the patterns below but they failed:

rule.pattern = QRegExp("\\b([A-Z])\\|([a-z])\\s");
 
or
 
rule.pattern = QRegExp("\\b([A-Z])|([a-z])\\s");

rule.pattern = QRegExp("\\b([A-Z])\\|([a-z])\\s");

or

rule.pattern = QRegExp("\\b([A-Z])|([a-z])\\s");

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the thing is i have no idea how to express vertical bar in this case.
anyone can help?

ps: i find the documentation from QRegExp is somehow not clearly explain all the cases.
is there any better tutorials for that?