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Ruby string.scan 问题

sevk · January 20, 2014 · Last by zw963 replied at January 22, 2014 · 3363 hits

想得到其中的"abcd" ，长度 4 .

s=  " sss\1\2abcd\xAA sss "
# 这里\1\2可能是\1\4  , 
# \1开头，\xAA结尾 , 长度4
# 我这样写：
s.scan(/\001[\002\004](.{4})\xAA/)[0]
#在ruby1.8里面可以正确执行，
#但1.9 2.0 报错了:
SyntaxError: (eval):2: invalid multibyte escape: /\001[\002\004](.{4})\xAA/

这里有啥好办法不？ 数据是某硬件串口通讯的。

zw963 #1 January 20, 2014

貌似，这种没有编码的正则匹配模式，在 1.9 之上，好像就不支持了？

zhufenggood #2 January 20, 2014 
" sss\1\2abcd\xAA sss ".force_encoding('ASCII-8BIT').scan(Regexp.new '\001[\002\004](.{4})\xAA', nil , 'n')[0] #if RUBY_VERSION >= "1.9"
4 likes
sevk #3 January 21, 2014

#2 楼 @zhufenggood 学习了，多谢

zw963 #5 January 22, 2014

刚刚问了下 Ri, 

When the kcode parameter is `n' or `N' sets the regexp no encoding. It
means that the regexp is for binary strings.
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