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hello,
I've been trying to understand the meaning of the following expression, but even with QtAssistant and QRegExp documentation, I could'nt get it.
QRegExp test(QLatin1String("^[a-zA-Z]+\\:.*"));
What I know:
the word matched has to start with a sequence of caracters from a to z or A to Z (can I change [a-zA-Z] to \\D instead?)
from \\: and on, I don't understand.
this String has to be an Url, I think.
thank you.
QRegExp docs are quite clear IMO. This regexp will match any string composed of :
- a sequence of one or more letters (basic latin alphabet)
- a colon ( ':' ) the (double due to C string escaping) backslash prevents this character from having any special meaning (though I don't remember it having one, well it will work anyway...)
- a sequence of ANY characters of ANY length (zero or more)
You could of course replace the set by \\D (non-digit class) but it might make more sense to use \\w (word class).
In a nutshell, this regexp certainly does NOT match URLs. The simplest description is that it matches key:value pairs key being made of latin letters and value of any characters.
hum. its weird this doesnt match Urls... anyways, thanks!
It will match URLs (ones with schemas) but only by accident (it will match u bunch of other things as well). If you want an expression for matching URLs then something like this is better:
It will at least make sure there are two slashes behind the colon. And it will allow schemas containing digits. I escaped the slashes themselves "just in case".
Oh, that will help
thank you.