Can you please let me know what does the curly braces do over here \{1,\}.
Scrutinizer is right. You can use this device to "multiply" a previous expression, similar to a "*", but with added functionality. For instance:
Code:
X # matches exactly one single "X"
X* # matches any number of "X"s, including zero
X\{3\} # matches exactly 3 "X"s
X\{1,\} # matches any number of "X"s, from 1 up
X\{,5\} # matches up to 5 "X"s
X\{3,5\} # matches 3 to 5 "X"s, hence either "XXX", "XXXX" or "XXXXX"
Notice, that, instead of a single character like "X" here, you can also modify complex expressions with that modifier. For instance:
Code:
|[^|]* # matches a "field" in tabular, pipe-separated data
# i.e. "|field1|field2|field3....."
\(|[^|]*\)\{3\} # matches 3 such fields
Hi,
I am new to shell scripting.I have worked somewhat with Perl though.
I am not able to find what the second line does and how does it do.
<code>
FP_RUNNING=`service filepool status`
FP_RUNNING=${FP_RUNNING%% *}
<\code>
After the first line,the variable FP_RUNNING stores '1 FilePool... (2 Replies)
Hi,
Im pretty new to Unix. I came across a script which was using PLSQL inside a script and there was an unusual thing mentioned.
there was a variable assigned as
P_CUR=${1}
and one more as
V_TAGFILE="$1"
Couldnt find the difference. Also the variables were used in PLSQL... (1 Reply)
Must be a bug or something. Whether I escape them or not, it will not work. No matter what I set the minimum and maximum to nothing gets caught. For instance:
find / -regex "/.{0, 50}.*" -maxdepth 1 or find / -regex "/.\{0, 50\}.*" -maxdepth 1 should pretty much catch everything residing within... (4 Replies)
Hi everyone:
I'm stuck at this point, could you guys please give me some hints about what I am doing wrong in the following script, I'm using sed for windows:
sed ^"$ {^
a^
STRINGTABLE DISCARDABLE^
BEGIN^
#define CLIENT_MODULE, "%CLIENT_MODULE%"^
#define CLIENT_ID, "%CLIENT_ID%"^... (1 Reply)
I'm having trouble understanding the exclude option in tar. From some web sites, it seems one is able to exclude several strings by enclosing them in curly brackets. However it seems to be "random" what gets excluded when using the curlies.
I've been using the exclude-from=myfile option in a... (12 Replies)
Hi everyone,
I've got a file that looks like this:
uid{508}pid{22224}pname{/PPROGRAM/pprgramx -profile:LIVE -serv:as ...
I want to pull the value of pid between the curly braces, or 22224 in this example. pid is always the second pair of curly braces, but the length of the number is... (7 Replies)
Hi Everyone,
in the below "xyz (Exception e)" part... after the curly braces, there is a new line and immediately few tabs are present before closing curly brace.
xyz (Exception e) {
}
note: there can be one or... (1 Reply)
Hi Everyone,
in the below "xyz (Exception e)" part... after the curly braces, there is a new line and immediately few tabs are present before closing curly brace.
xyz (Exception e) {
}
note: there can be one or more newlines between the curly braces.
My desired output should be ... (6 Replies)
Hello, i was trying to find get a command to list duplicated files so i tried
ls dir1 dir2 | awk '{x++}'
and it didnt work.
After a bit of searching online i found that it works without the curly braces
ls dir1 dir2 | awk 'x++'
I thought the curly braces were needed in awk so... (6 Replies)
file.txt
apple
apples{
applepicture
apple9
apple cake{
abple
apple_and_cake
appleapple
apple
apple(
and my script
while read line; do
if ]; then
echo "$line"
fi
done <file.txt
read (10 Replies)
Discussion started by: cmdcmd
10 Replies
LEARN ABOUT PLAN9
regexp
REGEXP(6) Games Manual REGEXP(6)NAME
regexp - regular expression notation
DESCRIPTION
A regular expression specifies a set of strings of characters. A member of this set of strings is said to be matched by the regular
expression. In many applications a delimiter character, commonly bounds a regular expression. In the following specification for regular
expressions the word `character' means any character (rune) but newline.
The syntax for a regular expression e0 is
e3: literal | charclass | '.' | '^' | '$' | '(' 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)