But here the task is to replace "." when prefixed and followed by an uppercase character.
Test:
...A.1.B. C.D. E.FX.
You further see how the /g modifier works. It repeats the expression on the remainder of the line, after the part that was covered by the previous expression.
If the repetition should include the last character of the previous expression, things become complicated. In this case one can run the whole statement twice:
...A.1.B. C. D. E. FX.
Hi I have two questions.
1. how to convert "EverythingIsFine" to "Everything Is Fine" in a txt file.
2. how to convert everything to upper case letter and reverse, I hope there is a general purpose script for this. (1 Reply)
Hi All,
I need to have a sed command insert the letter i at the end of some lines in a file.
Problem is that where I want to add the i is after variables that change in each file
eg, tsal314384'
tsal315386'
tsal317392'
I need to have it like this
... (2 Replies)
Im trying to add 5 blank spaces to the end of each line in a file in a sed script. I can figure out who o put the spaces pretty much anywhere else but at the end.
thanks
Karl (7 Replies)
Problem: I have a lot of files, the files first line should always have 4 spaces before any text. Occasionally some of the files will miss the leading spaces and it's a problem. This is only in the first line.
So if there are 4 spaces then text, do nothing. If there are not 4 spaces, add 4... (2 Replies)
I have a file:
575G /local/mis/SYBDUMP
I want to remove the G, K, M or T so I can use $1 in awk or sed to do math.
I want to end up with a file containing:
575 /local/mis/SYBDUMP
It should not matter how small or large the numeric numbers are so if 2, 3, 4, or 5 digits etc I want to see... (9 Replies)
Hi, i have this script
setenv.sh
if
then
echo "is empty"
fi
echo "done"
The following is the result when i run the script from command without and with a dot and space operator
$ setenv.sh
is empty
done
$ . setenv.sh
sh: VAR_1: Parameter not set.
$
It's our standard to run... (5 Replies)
Guys this is my 1st post so please excuse if i am asking something already answered
I am trying to write a script to send an alert whenever any of my servers runs low on disk space, i am getting the following output
9 Dir(s) 6,611,517,440 bytes free
I need to just get 6,611,517,440 from... (2 Replies)
Pattern:
Mary walks at the park every day with her children
sed 's/$/ /'
will make it add 1 space at the end (trailing)
I want to add X ($VARIABLE) number of spaces (which comes from RANDOM)
i.e.
VARIABLE='14'
then it will do:
sed 's/$/ /'
= 14 spaces added at the... (10 Replies)
I am trying to use awk to add a space in a string of text. My awk is close but does not produce the desured output. Thank you :).
input
washington aveLansing, MI
washington streetLansing, MI
Desired output
washington ave Lansing, MI
washington street Lansing, MI
awk -F"\t"... (9 Replies)
I have a pbd file, which has the following format:
TITLE Protein X
MODEL 1
ATOM 1 N PRO 24 45.220 71.410 43.810 1.00 0.00
ATOM 2 H1 PRO 24 45.800 71.310 42.000 1.00 0.00
TER
ENDMDL
Column 22 is the chain... (5 Replies)
Discussion started by: Egy
5 Replies
LEARN ABOUT PLAN9
regexp
REGEXP(6) Games Manual REGEXP(6)NAME
regexp - regular expression notation
DESCRIPTION
A regular expression specifies a set of strings of characters. A member of this set of strings is said to be matched by the regular
expression. In many applications a delimiter character, commonly bounds a regular expression. In the following specification for regular
expressions the word `character' means any character (rune) but newline.
The syntax for a regular expression e0 is
e3: literal | charclass | '.' | '^' | '$' | '(' e0 ')'
e2: e3
| e2 REP
REP: '*' | '+' | '?'
e1: e2
| e1 e2
e0: e1
| e0 '|' e1
A literal is any non-metacharacter, or a metacharacter (one of .*+?[]()|^$), or the delimiter preceded by
A charclass is a nonempty string s bracketed [s] (or [^s]); it matches any character in (or not in) s. A negated character class never
matches newline. A substring a-b, with a and b in ascending order, stands for the inclusive range of characters between a and b. In s,
the metacharacters an initial and the regular expression delimiter must be preceded by a other metacharacters have no special meaning and
may appear unescaped.
A matches any character.
A matches the beginning of a line; matches the end of the line.
The REP operators match zero or more (*), one or more (+), zero or one (?), instances respectively of the preceding regular expression e2.
A concatenated regular expression, e1e2, matches a match to e1 followed by a match to e2.
An alternative regular expression, e0|e1, matches either a match to e0 or a match to e1.
A match to any part of a regular expression extends as far as possible without preventing a match to the remainder of the regular expres-
sion.
SEE ALSO awk(1), ed(1), sam(1), sed(1), regexp(2)REGEXP(6)