a question about RE

孙牧 sunmu at netpower.com.cn
Fri Jan 16 22:56:34 PST 2004

hello everyone!

I have a question about a regular-expression line in "scan.l" file.
It is:
ESCSEQ (\\([^\n]|[0-7]+|x[[:xdigit:]]+))

I can't understand what "[[:xdigit:]]" means? 
Would you give me an explanation?

Thanks & Regards!

herdsman sun
Netpower Inc. in Beijing


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