Hi.
Can I extract the last 3 characters from a given string using sed ?
Why the following doesn't work (it prints the full string) :
echo "abcd" | sed '/\.\.\.$/p' doesn't work ?
output: abcd
Thanks in advance,
435 Gavea. (7 Replies)
I am trying to match a pattern exactly in a shell script. I have tried two methods
awk '/\<mpath${CURR_MP}\>/{print $1 $2}' multipath
perl -ne '/\bmpath${CURR_MP}\b/ and print' /var/tmp/multipath
Both these methods require that I use the escape character. I am guessing that is why... (8 Replies)
Hi,
I'm curious about how to do a very simple thing with regular expressions that I'm unable to figure out.
If I want to find out if a string contains 'a' AND 'b' AND 'c' it can be very easily done with grep:
echo $STRING|grep a|grep b|grep c
but, how would you do that in a single... (9 Replies)
how can i print all the chars of a string one by line?
i have thought that use a for cicle and use this command inside:
${VARIABLE:0:last}but how can i make last? because string is random
P.S. VARIABLE is the string
or can i make a variable for every chars of this string?
this was my idea... (10 Replies)
Hi all,
I'm trying to do some work on the authorized_keys file to do a check if there's any information after the hash key.. At the end of the hash key's in the file, there can be an = or ==
Is there a way to check if anything exists after these equals and if so print it out or else print... (2 Replies)
Hello,
I need an awk command to print only the lines that match regex on xth field from file.
For example if I use this command
awk -F"|" ' $22 == "20130117090000.*" 'It wont work, I think, because single quotes wont allow the usage of the metacharacter star * . On the other hand I dont know... (2 Replies)
Hi,
I have the logs :
cat logsx.txt
744906,{"reportingGroups":,"version":"2.0"}
678874,{"reportingGroups":,"version":"2.0"}
193571,{"reportingGroups":,"version":"2.0"}
811537,{"reportingGroups":,"version":"2.0"}
772024,{"reportingGroups":,"version":"2.0"}... (5 Replies)
Greetings Experts,
I am in AIX; I have a file generated through awk after processing the input files. Now I need to replace or remove the new-line characters on all lines that doesn't have a ; which is the last character on the line. I tried to use sed 's/\n/ /g' After checking through the... (6 Replies)
Hi,
I have been trying to find help with my issue and I'm thinking awk may be able to do it.
I have two files eg
file1.txt
STRING1 230 400 0.36
STRING2 400 230 -0.13
STRING3 130 349 1
file2.txt
CUFFFLINKS 1 1394 93932 . + STRING1
CUFFFLINKS ... (9 Replies)
Discussion started by: zward
9 Replies
LEARN ABOUT PHP
preg_split
PREG_SPLIT(3) 1 PREG_SPLIT(3)preg_split - Split string by a regular expressionSYNOPSIS
array preg_split (string $pattern, string $subject, [int $limit = -1], [int $flags])
DESCRIPTION
Split the given string by a regular expression.
PARAMETERS
o $pattern
- The pattern to search for, as a string.
o $subject
- The input string.
o $limit
- If specified, then only substrings up to $limit are returned with the rest of the string being placed in the last substring. A
$limit of -1, 0 or NULL means "no limit" and, as is standard across PHP, you can use NULL to skip to the $flags parameter.
o $flags
-$flags can be any combination of the following flags (combined with the | bitwise operator):
o PREG_SPLIT_NO_EMPTY - If this flag is set, only non-empty pieces will be returned by preg_split(3).
o PREG_SPLIT_DELIM_CAPTURE - If this flag is set, parenthesized expression in the delimiter pattern will be captured and
returned as well.
o PREG_SPLIT_OFFSET_CAPTURE - If this flag is set, for every occurring match the appendant string offset will also be
returned. Note that this changes the return value in an array where every element is an array consisting of the matched
string at offset 0 and its string offset into $subject at offset 1.
RETURN VALUES
Returns an array containing substrings of $subject split along boundaries matched by $pattern.
EXAMPLES
Example #1
preg_split(3) example : Get the parts of a search string
<?php
// split the phrase by any number of commas or space characters,
// which include " ",
, ,
and f
$keywords = preg_split("/[s,]+/", "hypertext language, programming");
print_r($keywords);
?>
The above example will output:
Array
(
[0] => hypertext
[1] => language
[2] => programming
)
Example #2
Splitting a string into component characters
<?php
$str = 'string';
$chars = preg_split('//', $str, -1, PREG_SPLIT_NO_EMPTY);
print_r($chars);
?>
The above example will output:
Array
(
[0] => s
[1] => t
[2] => r
[3] => i
[4] => n
[5] => g
)
Example #3
Splitting a string into matches and their offsets
<?php
$str = 'hypertext language programming';
$chars = preg_split('/ /', $str, -1, PREG_SPLIT_OFFSET_CAPTURE);
print_r($chars);
?>
The above example will output:
Array
(
[0] => Array
(
[0] => hypertext
[1] => 0
)
[1] => Array
(
[0] => language
[1] => 10
)
[2] => Array
(
[0] => programming
[1] => 19
)
)
NOTES
Tip
If you don't need the power of regular expressions, you can choose faster (albeit simpler) alternatives like explode(3) or
str_split(3).
Tip
If matching fails, an array with a single element containing the input string will be returned.
SEE ALSO
PCRE Patterns, preg_quote(3), implode(3), preg_match(3), preg_match_all(3), preg_replace(3), preg_last_error(3).
PHP Documentation Group PREG_SPLIT(3)