s is the string you want to perform the substr operation on i is the first character that you want to extract n is the last character you want to match
So if you said substr( "hello", 2, 4 ) it would match the second, third and fourth character and return ell.
Let me explain the code I gave
In the above example, the first argument to substr is $0 (which in this case is the text piped to it - "$0" is the entire record). The second argument is 0 (I could also have used 1) because I want to match from the start of the string. I want to grab the first four characters, so the third argument is 4.
The above code also makes use length(string) command to return the number of characters in the string.
So here, I'm saying "return the substring from the first character (which is the length of the string minus 3), up until the very end of the string".
To clarify this:
So in our substr, we grab from character 4 to character 7 inclusive, which are chars 4,5,6,7 - the last 4 chars.
how to parse the command line argument to look for '@' sign and the following with '.'.
In my shell script one of the argument passed is email address. I want to parse this email address to look for correct format.
rmjoe123@hotmail.com has '@' sign and followed by a '.'
to be more... (1 Reply)
Hi,
I have a requirement. I have an application which can take a file as inputs. Now the file can contain any number of lines. The tool has to pick up the first uncommented line and begin processing it.
For example the file could be like this:
#MANI123|MANI1234
#MANI234|MANI247... (4 Replies)
I have record line somthing like below with first line showing char spacing not real record line
1 | 2 | 3rd Field--------------|-4th field--| This is charcatersapcing of line
DF20000000000000000130.7890000000750
I shoudl get two line from above line
1st line should
1 | 2 | 3rd... (3 Replies)
#I'm quite new to scripting and my boss has asked me to solve a simple problem and sadly, I can't figure out how to do it. Any help is appreciated.
:confused:
#The following is a small shell script and the output that it produces for google.com.
#!/bin/sh
whois $1 | grep "Name Server"... (5 Replies)
Hey guys,
I have this file generated by me... i want to create some HTML output from it.
The problem is that i am really confused about how do I go about reading the file.
The file is in the following format:
TID1 Name1 ATime=xx AResult=yyy AExpected=yyy BTime=xx BResult=yyy... (8 Replies)
Hi everybody, I have a string stored in a variable called record:
record="SNMPv2-SMI::ent.9.9.43.1.3.9.2 = Timeticks: (177330898) 20 days, 12:35:08.98"
I want to write some regular expressions good for Korn Shell to extract the number between parenthesis, in this case 177330898, and put it in... (3 Replies)
I have a xml file like this
<bul:collectionStrategy name="strategy1">
<bul:collectionTemplateGroup name="15min group"/>
<bul:collectionTemplateGroup name="hourly group"/>
</bul:collectionStrategy>
<bul:CollectionTemplateGroup name="hourly group" >
... (2 Replies)
I have a file parameters.txt which contains
151524
151525
I have another file OID.csv which contains
NE Version Object Type ID SDK param name Object OID
test1 Start: 4.2 End: 4.2 pan 151524 speed ... (5 Replies)
Well, issue is i have to parse this script to get the VERSION:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>
<key>CFBundleAllowMixedLocalizations</key>
... (9 Replies)
Hi,
I need some guidance with understanding this Perl script below. I am not the author of the script and the author has not leave any documentation. I supposed it is meant to be 'easy' if you're a Perl or regex guru. I am having problem understanding what regex to use :confused: The script does... (3 Replies)
Discussion started by: newbie_01
3 Replies
LEARN ABOUT PHP
strspn
STRSPN(3) 1 STRSPN(3)strspn - Finds the length of the initial segment of a string consisting entirely of characters contained within a given mask.SYNOPSIS
int strspn (string $subject, string $mask, [int $start], [int $length])
DESCRIPTION
Finds the length of the initial segment of $subject that contains only characters from $mask.
If $start and $length are omitted, then all of $subject will be examined. If they are included, then the effect will be the same as call-
ing strspn(substr($subject, $start, $length), $mask) (see "substr" for more information).
The line of code:
<?php
$var = strspn("42 is the answer to the 128th question.", "1234567890");
?>
2 to $var, because the string "42" is the initial segment of $subject that consists only of characters contained within "1234567890".
PARAMETERS
o $subject
- The string to examine.
o $mask
- The list of allowable characters.
o $start
- The position in $subject to start searching. If $start is given and is non-negative, then strspn(3) will begin examining $sub-
ject at the $start'th position. For instance, in the string ' abcdef', the character at position 0 is ' a', the character at posi-
tion 2 is ' c', and so forth. If $start is given and is negative, then strspn(3) will begin examining $subject at the $start'th
position from the end of $subject.
o $length
- The length of the segment from $subject to examine. If $length is given and is non-negative, then $subject will be examined for
$length characters after the starting position. If $length is given and is negative, then $subject will be examined from the
starting position up to $length characters from the end of $subject.
RETURN VALUES
Returns the length of the initial segment of $subject which consists entirely of characters in $mask.
EXAMPLES
Example #1
strspn(3) example
<?php
// subject does not start with any characters from mask
var_dump(strspn("foo", "o"));
// examine two characters from subject starting at offset 1
var_dump(strspn("foo", "o", 1, 2));
// examine one character from subject starting at offset 1
var_dump(strspn("foo", "o", 1, 1));
?>
The above example will output:
int(0)int(2)int(1)NOTES
Note
This function is binary-safe.
SEE ALSO strcspn(3).
PHP Documentation Group STRSPN(3)