使用 sed 提取二元组

使用 sed 提取二元组

如何将仅由字母组成的整个文本拆分为二元组。

例如:

奇偶

od -> de
dd -> ev

这是我到目前为止所拥有的,但它没有产生预期的结果。

[some source] | tail -n +30 | sed 's/[^A-Za-z\n]//g' | sed 's/\([A-Za-z]\)\([A-Za-z]\)\([A-Za-z]\)\([A-Za-z]\)\([A-Za-z]\)\{\0,1\}/\1\2 -> \3\4, \2\3 -> \4\5, /g' | sed 's/,/,\n/g'

答案1

尝试下一个sed脚本:

内容infile

odd even
one test        of              bigrams

内容script.sed

## Inside square brackets there are two characters: space and tab.
## The instruction deletes them of the line.
s/[     ]*//g

## Label 'b'.
:b

## Copy line to 'hold space'.
h

## Get first bigram.
s/\(..\)\(..\).*/\1 -> \2/

## If last substitution succeed, continue to label 'a'.
ta

## Here last substitution failed: It means that line has less than four
## characters to extract a bigram, so read next line.
b

## Label 'a'
:a

## Print.
p

## Copy 'hold space' into 'pattern space'.
g

## Delete first character.
s/^.//

## Goto label 'b' to repeat loop.
tb

运行脚本:

sed -nf script.sed infile

结果:

od -> de
dd -> ev
de -> ve
ev -> en
on -> et
ne -> te
et -> es
te -> st
es -> to
st -> of
to -> fb
of -> bi
fb -> ig
bi -> gr
ig -> ra
gr -> am
ra -> ms

答案2

这可能对你有用:

echo -e "od\ndd\nde\nve" | 
sed '1{x;s/^/oddevenodd/;x};G;/^\(..\)\n.*\1\(..\).*/s//\1 -> \2/'
od -> de
dd -> ev
de -> ve
ve -> no

你是这个意思吗?

echo -e "odd even\nthis and that" | 
sed 's/ //g;s/^\(..\)\(.*\)/\1\2\1/;h;:a;s/^\(..\)\(..\).*/\1 -> \2/p;g;/^..../{s/^..//;h;ba};d'
od -> de
de -> ve
ve -> no
th -> is
is -> an
an -> dt
dt -> ha
ha -> tt

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