linux shell 正则匹配

tfcra

#先生成你要的类似的字符串
var=`echo "9DFS9fBzGGEa%K5t" | grep -E '.+{16}'`

#分成四组，每组单独做正则匹配，符合的话，再存回每组的变量中，不符合则为空，清空变量
arr1=`echo ${var:0:4}`
arr1=`echo $arr1 | grep -P '\d'`

arr2=`echo ${var:4:4}`
arr2=`echo $arr2 | grep -P '[a-z]'`

arr3=`echo ${var:8:4}`
arr3=`echo $arr3 | grep -P '[A-Z]'`

arr4=`echo ${var:12:4}`
arr4=`echo $arr4 | grep -P '[%*@#]'`

#最后合并，判断是否为16位字符串，如果是，则能够输出$var变量
var=`echo $arr1$arr2$arr3$arr4 | grep -E '.+{16}'`
echo $var

csccyab

Use regex positive lookahead:

echo "9DFS9fBzGGEa%K5t" | grep -P '^(?=.{0,3}\d)(?=.{4,7}[a-z])(?=.{8,11}[A-Z])(?=.{12,15}[\W_]).{16}$'

1cpuer

#.,; 2018-10-05 14:06:31 1538719591 :!3431!: /i/je-d/sou-d
#.,: echo '1234ASDFasdf&*()' | grep -Po '\d{4}[A-Z]{4}[a-z]{4}\pP{4}'
1234ASDFasdf&*()
#.,; 2018-10-05 14:06:38 1538719598 :!3432!: /i/je-d/sou-d
#.,: echo 'x234ASDFasdf&*()' | grep -Po '\d{4}[A-Z]{4}[a-z]{4}\pP{4}'
#.,; 2018-10-05 14:06:51 1538719611 :!3433!: /i/je-d/sou-d
#.,: echo '1234ASDFasdf&*()' | grep -Po '\d{4}[A-Z]{4}[a-z]{4}\pP{4}'
1234ASDFasdf&*()
#.,; 2018-10-05 14:08:21 1538719701 :!3434!: /i/je-d/sou-d
#.,: echo 'x234ASDFasdf&*()' | grep -Po '\d{4}[A-Z]{4}[a-z]{4}\pP{4}'
#.,; 2018-10-05 14:08:30 1538719710 :!3435!: /i/je-d/sou-d
#.,: echo 'x234ASDFasdf&*()' | grep -Po '\d{4}|.{4}[A-Z]{4}|.{4}[a-z]{4}|.{4}\pP{4}|.{4}'
x234ASDF
asdf&*()
#.,; 2018-10-05 14:09:24 1538719764 :!3436!: /i/je-d/sou-d
#.,: echo '1a' | grep -Po '[0-9]|*{1}[a-z]|*{1}'
grep: nothing to repeat
#.,; 2018-10-05 14:10:39 1538719839 :!3437!: /i/je-d/sou-d
#.,: echo '1a' | grep -Po '[0-9]|.{1}[a-z]|.{1}'
1
a

1cpuer

回复 1# router_id

#.,; 2018-10-05 14:06:31 1538719591 :!3431!: /i/je-d/sou-d
#.,: echo '1234ASDFasdf&*()' | grep -Po '\d{4}[A-Z]{4}[a-z]{4}\pP{4}'
1234ASDFasdf&*()
#.,; 2018-10-05 14:06:38 1538719598 :!3432!: /i/je-d/sou-d
#.,: echo 'x234ASDFasdf&*()' | grep -Po '\d{4}[A-Z]{4}[a-z]{4}\pP{4}'
#.,; 2018-10-05 14:06:51 1538719611 :!3433!: /i/je-d/sou-d
#.,: echo '1234ASDFasdf&*()' | grep -Po '\d{4}[A-Z]{4}[a-z]{4}\pP{4}'
1234ASDFasdf&*()
#.,; 2018-10-05 14:08:21 1538719701 :!3434!: /i/je-d/sou-d
#.,: echo 'x234ASDFasdf&*()' | grep -Po '\d{4}[A-Z]{4}[a-z]{4}\pP{4}'
#.,; 2018-10-05 14:08:30 1538719710 :!3435!: /i/je-d/sou-d
#.,: echo 'x234ASDFasdf&*()' | grep -Po '\d{4}|.{4}[A-Z]{4}|.{4}[a-z]{4}|.{4}\pP{4}|.{4}'
x234ASDF
asdf&*()
#.,; 2018-10-05 14:09:24 1538719764 :!3436!: /i/je-d/sou-d
#.,: echo '1a' | grep -Po '[0-9]|*{1}[a-z]|*{1}'
grep: nothing to repeat
#.,; 2018-10-05 14:10:39 1538719839 :!3437!: /i/je-d/sou-d
#.,: echo '1a' | grep -Po '[0-9]|.{1}[a-z]|.{1}'
1
a

1cpuer

#.,; 2018-10-05 14:38:51 1538721531 :!3453!: /i/je-d/sou-d
#.,: echo 'xX34ASDFasdf&*()' | grep -Po '(\d{4}|.{4})([A-Z]{4}|.{4})([a-z]{4}|.{4})(\W{4}|.{4})'
xX34ASDFasdf&*()

MherEs

本友会机友会摄友会 发表于 2018-09-11 16:06
不用正则这道题写起来很简单。

============================

同意你说的观点，有时候没必要绞尽脑汁非要压缩到一条命令，唯一理由就是节约系统开销，问题是能节约多少呢，我写脚本就是你说的这种狂拆流，拆分每个细节，之后排查问题都很方便，前提是要写好注释，另外，模块细分了也有好处，可以全局调用，如果是单条命令的压缩结构，那脚本里面如果逻辑很多的话，其实更加复杂，每个逻辑都有独立的命令去完成，根本无法做到合理调度；反而显得这个脚本就是一个纯面向过程的“死”脚本；

wh7211

回复 1# router_id

1. cat 1
   
2. aaaabbbbccccddd
   
3. aaaabbbbccccdddd
   
4. aaaabbbbccccdddde
   
5. 1aaaBbbbcccc^ddd
   
6. aaaabbbbccccdddd
   
7. 
   
8. awk -F "" 'function p(x){for(i=++a;i<=a+3;i++){if($i~x){b[a]=1}};a=i-1};length($0)==16{p("[0-9]");p("[A-Z]");p("[a-z]");p("[^0-9a-zA-Z]");if(b[1]&&b[5]&&b[9]&&b[13]){print};a="";delete b}' 1
   
9. 1aaaBbbbcccc^ddd

复制代码

router_id

回复 11# tfcra

谢谢你！给我新的思路。非常感谢!

router_id

回复 15# 1cpuer

谢谢！非常感谢！我好好理解您提供的正则。受教了!
可能还是有点问题，很多不满足条件也匹配上了。
满足条件为下面粗体部分。我测试的原始数据为：
9DFS9fBzGGEa%K5t
q5-(S+$ePLMWO76S
BYd+#SFGZ@OUzXTc
jTJR9LE8(696nGHg
fa586d%OKF%tJc+Q
H!FiB72EK1JHa%x1
Wu1RMG^!pHV3qEj1
q8#TlWYbT%G^q8@i
iMaPM3xOLhQQ0MK1
cRhMz(nbw4KQwnsp
HwI&Dhp8BIfToClP
Vb1EPfdB(rQt7pm^
0)X4v!6lg@63()U1
j#@ki^h@CT#8Nbb5


grep测试结果如下

[root@hsckey c]# cat grep.txt | grep -Po '(\d{4}|.{4})([A-Z]{4}|.{4})([a-z]{4}|.{4})(\W{4}|.{4})'
9DFS9fBzGGEa%K5t
q5-(S+$ePLMWO76S
BYd+#SFGZ@OUzXTc
jTJR9LE8(696nGHg
fa58d%OK6F%tJc+Q
H!FiB72EK1JHa%x1
Wu1RMG^!pHV3qEj1
q8#TlWYbT%G^q8@i
iMaPM3xOLhQQ0MK1
cRhMz(nbw4KQwnsp
HwI&Dhp8BIfToClP
Vb1EPfdB(rQt7pm^
0)X4v!6lg@63()U1
j#@ki^h@CT#8Nbb5

router_id

回复 15# 1cpuer

谢谢！非常感谢！我好好理解您提供的正则。受教了!
可能还是有点问题，很多不满足条件也匹配上了。
满足条件为下面粗体部分。我测试的原始数据为：
9DFS9fBzGGEa%K5t
q5-(S+$ePLMWO76S
BYd+#SFGZ@OUzXTc
jTJR9LE8(696nGHg
fa586d%OKF%tJc+Q
H!FiB72EK1JHa%x1
Wu1RMG^!pHV3qEj1
q8#TlWYbT%G^q8@i
iMaPM3xOLhQQ0MK1
cRhMz(nbw4KQwnsp
HwI&Dhp8BIfToClP
Vb1EPfdB(rQt7pm^
0)X4v!6lg@63()U1
j#@ki^h@CT#8Nbb5


grep测试结果如下

[root@hsckey c]# cat grep.txt | grep -Po '(\d{4}|.{4})([A-Z]{4}|.{4})([a-z]{4}|.{4})(\W{4}|.{4})'
9DFS9fBzGGEa%K5t
q5-(S+$ePLMWO76S
BYd+#SFGZ@OUzXTc
jTJR9LE8(696nGHg
fa58d%OK6F%tJc+Q
H!FiB72EK1JHa%x1
Wu1RMG^!pHV3qEj1
q8#TlWYbT%G^q8@i
iMaPM3xOLhQQ0MK1
cRhMz(nbw4KQwnsp
HwI&Dhp8BIfToClP
Vb1EPfdB(rQt7pm^
0)X4v!6lg@63()U1
j#@ki^h@CT#8Nbb5