Im having a bit of difficulty with this one and I suspect its because of the character I want to match against maybe causing me a problem, but i wanted to remove everything up to (but not including) the first instance of '{' in a string
so for example the string that I want to manupulate is ...
I have highlighted in RED the point with which I want to keep ...The bit in blue at the beginning is what I want to remove
So basically i want to remove everything up to but not including the first instance of '{' only .
I have tried various techniques none of which seem to be working for me, hence my arrival on this forum
Does anyone know a good way of doing this ?
Any help on this would be greatly appreciated
thanks
I have few files in unix which are in dos format. While I am copying these files, ^M, ^@, etc characters are being generated.
I tried dos2unix command in Linux and it doesn't work.
I tried sed to remove these characters but they won't go.
I came to about this 'tr' command and tried to use it... (16 Replies)
Hi,
I have a very huge file and it contains some unprintable characters like ^H and ^D.
If I try to remove using cat test1.ser| tr -d '\136 110'>newfile1 it is only removing ^and all spaces in the file.
How can I remove these characters (^D ^H) and keep my spaces as it is?
Thanks &... (1 Reply)
Hi all,
Any help on how to do the following? :eek:
I have an infile as follows:
_thisishowyouwritehelloworld
_thisisalsohowyouwritehelloworld2
I want to delete the characters from "_" to "how" and be left with:
youwritehelloworld
youwritehelloworld2
I am able to do delete from a... (2 Replies)
hi
I have a perl script conv.pl. when i execute this file and direct i to log file I see lots of ^M characters in the log file. There is no ^M in conv.pl file. Log file is generated only after conv.pl is executed.
Please help as how to get rid of these.
This conv.pl is going to get schduled... (0 Replies)
hi
I have a perl script conv.pl. when i execute this file and direct i to log file I see lots of ^M characters in the log file. There is no ^M in conv.pl file. Log file is generated only after conv.pl is executed.
Please help as how to get rid of these.
This conv.pl is going to get schduled... (5 Replies)
Dear Friends,
I want to remove text between two patters.
Problem is, it has random special characters like \ / | * ` ~ ! $ etc.
These random special characters has no fixed length. But these special characters are appearing between a fixed pattern
e.g.
DM&^%#|#!\/?CT
Expected output... (14 Replies)
Hi,
in a file, i have records as below:
123|62|absnb|267629
123|267|28728|uiuip
123|567|26761|2676
i want to remove the non printable characters after the end of each record.
I guess there are certain charcters but not visible.
i don't know what character that is exactly.
I used... (2 Replies)
I have been given a shell script that I need to amend. To do the following
extract the filename from the flag file by removing the .flag extension.
# Local variables
# Find if the flag files exists
MASK=coda_mil2*.flag
# Are there any files?
bookmark="40"
fileFound=0
ls -1... (3 Replies)
Hi guys,
So I am using an awk command to return a specific column in a file.
I also need to remove some extra characters.
What I have is ::
(http-/0.0.0.0:8091-9)|23:00:41
And what I want is :
http-/0.0.0.0:8091-9
I tried using the td command but it is only removing the ( ,... (5 Replies)
Discussion started by: Junaid Subhani
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)