how to find the all the lines where they are the same like A(A)(A), B(B)(B), Z(Z)(Z)?

Question

For example:

sfdAAAzsd
sdfBBBadf
sd1ZZZsdf 

Hightlighted:

sfd"AAA"zsd
sdf"BBB"adf
sd1"ZZZ"sdf

all letters will be searched only

Answer 1

As inspired from this answer, we can search with

/\([A-Z]\)\1\{2}

Here is what the pattern after / does:

• [A-Z] match any uppercase letter A to Z
• \(...\) capture this (what is within \( and \)) and possibly refer to it later
• \1 refer to the first item captured with \(...\)
• \{2} match 2 of the preceding items (\1 in this case)

Thus the pattern above will match AAA,BBB,...,ZZZ.

To print the lines that match {pattern} we can use the :g[lobal] command, that is

:g/{pattern}/

We can omit {pattern} to use the last used search pattern, ie.

:g//