This means "replace the first character which isn't a 'x' with nothing". Since that's done as soon as the first 't' is replaced, sed is finished. If you want to remove all characters leading up to the first 'x', use
In the second snipped:
you're replacing as many characters as possible from the start until the last possible 'a' with the matched 'a'. The rest of the string isn't affected, so 'x_a_b_a_c_a' is replaced by 'a', which changes 'x_a_b_a_c_a_d' to 'a_d'
Third:
means "starting with a dash, take as many non-dash characters as possible until the end, and replace them with nothing", or "remove everything starting from and including the last possible dash".
Hello..
i want to use variable in sed..
like
sed 's/ROOTMAILID/$variable/g' conf.test
but its not working..
please help
thanks in advance
esham (2 Replies)
hi all,
i have a variable exported as
VAR=ATTRIB
then tried with,
echo "tt" | sed 's/^/$VAR/'
expected result as
ttATTRIB
but obtained only,
$VARtt
i could nt get where i am wrong.
Thanks. (3 Replies)
PLEASE EXPLANIN ME...
sed 's~\(.*\)\(<name>\)\(.*\)\(</name>\)\(.*\)~\2\3\4~'
this is the format
<start><name>123<\name><addr>BAC<\addr><loc>sfo<\loc></start> (1 Reply)
Hi,
The following command works fine for me, but I could not grasp the logic working behind of sed command, it's obscure to me :( :confused:
echo "./20080916/core/audioex.amr" | sed "s%\(\)/%\1_%g"
o/p: ./20080916_core_audioex.amr
Could anyone please explain to me in detail, that how... (6 Replies)
Hi,
i need find and replace a sting with a new variable having value as spaces in between.
Eg:
set a = "i am variable"
set b = "i am second"
sed -e 's/find_string/'$a'/g' -e 's/find2_str/'$b'/g' input_file
here it is giving error...
How to get an varaible, which is... (6 Replies)
Hi,
I need to get the value of 'uid' from a line in file f1. For example, in the line below, I need to get the value '150', from the 'anonuid=150' key, and I need to verify that this is a valid uid by checking it against /etc/passwd (i.e) I want to compare this uid, 150 (or more if there are any... (2 Replies)
Hi All
Can some one explain what does the given two sed commands do :confused:
sed "s/\'/\\\'/g" |
sed 's/\"/\\\"/g'
Please find the sample code i used to find out what this is doing , but it has confused me more :wall:
$ cat sri1.txt
\
'
"
$ sed 's/\"/\\\"/g' sri1.txt
\
'... (5 Replies)
Discussion started by: Sri3001
5 Replies
LEARN ABOUT PHP
substr_replace
SUBSTR_REPLACE(3) 1 SUBSTR_REPLACE(3)substr_replace - Replace text within a portion of a stringSYNOPSIS
mixed substr_replace (mixed $string, mixed $replacement, mixed $start, [mixed $length])
DESCRIPTION substr_replace(3) replaces a copy of $string delimited by the $start and (optionally) $length parameters with the string given in $replace-
ment.
PARAMETERS
o $string
- The input string. An array of strings can be provided, in which case the replacements will occur on each string in turn. In
this case, the $replacement, $start and $length parameters may be provided either as scalar values to be applied to each input
string in turn, or as arrays, in which case the corresponding array element will be used for each input string.
o $replacement
- The replacement string.
o $start
- If $start is positive, the replacing will begin at the $start'th offset into $string. If $start is negative, the replacing will
begin at the $start'th character from the end of $string.
o $length
- If given and is positive, it represents the length of the portion of $string which is to be replaced. If it is negative, it rep-
resents the number of characters from the end of $string at which to stop replacing. If it is not given, then it will default to
strlen( $string ); i.e. end the replacing at the end of $string. Of course, if $length is zero then this function will have the
effect of inserting $replacement into $string at the given $start offset.
RETURN VALUES
The result string is returned. If $string is an array then array is returned.
EXAMPLES
Example #1
Simple substr_replace(3) examples
<?php
$var = 'ABCDEFGH:/MNRPQR/';
echo "Original: $var<hr />
";
/* These two examples replace all of $var with 'bob'. */
echo substr_replace($var, 'bob', 0) . "<br />
";
echo substr_replace($var, 'bob', 0, strlen($var)) . "<br />
";
/* Insert 'bob' right at the beginning of $var. */
echo substr_replace($var, 'bob', 0, 0) . "<br />
";
/* These next two replace 'MNRPQR' in $var with 'bob'. */
echo substr_replace($var, 'bob', 10, -1) . "<br />
";
echo substr_replace($var, 'bob', -7, -1) . "<br />
";
/* Delete 'MNRPQR' from $var. */
echo substr_replace($var, '', 10, -1) . "<br />
";
?>
Example #2
Using substr_replace(3) to replace multiple strings at once
<?php
$input = array('A: XXX', 'B: XXX', 'C: XXX');
// A simple case: replace XXX in each string with YYY.
echo implode('; ', substr_replace($input, 'YYY', 3, 3))."
";
// A more complicated case where each replacement is different.
$replace = array('AAA', 'BBB', 'CCC');
echo implode('; ', substr_replace($input, $replace, 3, 3))."
";
// Replace a different number of characters each time.
$length = array(1, 2, 3);
echo implode('; ', substr_replace($input, $replace, 3, $length))."
";
?>
The above example will output:
A: YYY; B: YYY; C: YYY
A: AAA; B: BBB; C: CCC
A: AAAXX; B: BBBX; C: CCC
NOTES
Note
This function is binary-safe.
SEE ALSO str_replace(3), substr(3), String access and modification by character.
PHP Documentation Group SUBSTR_REPLACE(3)