Learn basic regex for Linux in 2 minutes

December 19, 2017

re : strings in which
^a : a is the beginning char
a$ : a is the end char
a? : 0 or 1 a
a+ : 1 or more a
a* : 0 or more a
^a : doesn't contains a
. : matches any character

{3,5} : range of 3 to 5
[abcf] : matches any one of a,b,c or f
[[:space:]] : matches spaces
[[:space:]]{4,} : matches 4 or more spaces
[a-z] : a to z
[a-zA-Z] : a to z and A to Z

d : any digit
s : space
w : any alphabet

w+(.ab)w+(53) : grouping (.ab) into group 1 and (53) into group 2, use them using \1,\2

Exercises:

1. ab(cd)ef to abcdef
rename -f 's/$[a-zA-Z0-9]+$//g' *

2. ab_cde_f to ab cde f
rename -f 's/_/ /g' *

3. 0abcde to abcde
rename -f 's/(0)+([0-9a-zA-Z-.]+)/$2/g' *

4. a.enbc to a bc
rename -f 's/\.en/ /g' *

5. a-bcdef to a bcdef
rename -f 's/-/ /g' *

6. AbcDeF to abcdef
rename -f 'y/A-Z/a-z/' *

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Learn basic regex for Linux in 2 minutes

re : strings in which
^a : a is the beginning char
a$ : a is the end char
a? : 0 or 1 a
a+ : 1 or more a
a* : 0 or more a
^a : doesn't contains a
. : matches any character

{3,5} : range of 3 to 5
[abcf] : matches any one of a,b,c or f
[[:space:]] : matches spaces
[[:space:]]{4,} : matches 4 or more spaces
[a-z] : a to z
[a-zA-Z] : a to z and A to Z

d : any digit
s : space
w : any alphabet

w+(.ab)w+(53) : grouping (.ab) into group 1 and (53) into group 2, use them using \1,\2

Exercises:

1. ab(cd)ef to abcdef
rename -f 's/\([a-zA-Z0-9]+\)//g' *

2. ab_cde_f to ab cde f
rename -f 's/_/ /g' *

3. 0abcde to abcde
rename -f 's/(0)+([0-9a-zA-Z-.]+)/$2/g' *

4. a.enbc to a bc
rename -f 's/\.en/ /g' *

5. a-bcdef to a bcdef
rename -f 's/-/ /g' *

6. AbcDeF to abcdef
rename -f 'y/A-Z/a-z/' *

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Learn basic regex for Linux in 2 minutes

re : strings in which^a : a is the beginning chara$ : a is the end chara? : 0 or 1 aa+ : 1 or more aa* : 0 or more a^a : doesn't contains a. : matches any character

{3,5} : range of 3 to 5[abcf] : matches any one of a,b,c or f[[:space:]] : matches spaces[[:space:]]{4,} : matches 4 or more spaces[a-z] : a to z[a-zA-Z] : a to z and A to Z

d : any digits : spacew : any alphabet

w+(.ab)w+(53) : grouping (.ab) into group 1 and (53) into group 2, use them using \1,\2

Exercises:

1. ab(cd)ef to abcdef rename -f 's/\([a-zA-Z0-9]+\)//g' *

2. ab_cde_f to ab cde f rename -f 's/_/ /g' *

3. 0abcde to abcde rename -f 's/(0)+([0-9a-zA-Z-.]+)/$2/g' *

4. a.enbc to a bc rename -f 's/\.en/ /g' *

5. a-bcdef to a bcdef rename -f 's/-/ /g' *

6. AbcDeF to abcdef rename -f 'y/A-Z/a-z/' *

Comments

Post a Comment

Popular posts from this blog

How to setup a DC hub in your local network

Some basic linux hacks

re : strings in which
^a : a is the beginning char
a$ : a is the end char
a? : 0 or 1 a
a+ : 1 or more a
a* : 0 or more a
^a : doesn't contains a
. : matches any character

{3,5} : range of 3 to 5
[abcf] : matches any one of a,b,c or f
[[:space:]] : matches spaces
[[:space:]]{4,} : matches 4 or more spaces
[a-z] : a to z
[a-zA-Z] : a to z and A to Z

d : any digit
s : space
w : any alphabet

1. ab(cd)ef to abcdef
rename -f 's/\([a-zA-Z0-9]+\)//g' *

2. ab_cde_f to ab cde f
rename -f 's/_/ /g' *

3. 0abcde to abcde
rename -f 's/(0)+([0-9a-zA-Z-.]+)/$2/g' *

4. a.enbc to a bc
rename -f 's/\.en/ /g' *

5. a-bcdef to a bcdef
rename -f 's/-/ /g' *

6. AbcDeF to abcdef
rename -f 'y/A-Z/a-z/' *