Sponsored Content
Full Discussion: Regular expression matching
Top Forums Shell Programming and Scripting Regular expression matching Post 302408633 by tmf33uk on Tuesday 30th of March 2010 05:49:15 AM
Old 03-30-2010
Regular expression matching

Hi,
I have a variable in my script that gets its value from a procstack output. It could be a number of any length, or it could just be a '1' with 0 or more white spaces around it. I would like to detect when this variable is just a 1 and not a 1234, for example. This is as far as I got:

Code:
#!/bin/ksh
var1="1"
if [[ ${var1} = ^1$ ]] then
echo $var1
else echo "Bad"
fi
exit

And the execution goes like this:
Code:
./borrame.sh
Bad

How can I get it to check that the value is just 1, with either spaces or not around it, but cernainly not digits?

Thanks in advance. I get the feelign this is quite easy-peasy but I canīt get my head around regular expressions yet.

T.

Last edited by zxmaus; 03-30-2010 at 06:52 AM.. Reason: added code tags
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Regular expression matching a new line

I have written a script to test some isdn links in my network and I am trying to format the output to be more readable. Each line of the output has a different number of digits as follows... Sitename , spid1 12345678901234 1234567890 1234567 , spid2 1234567890 1234567890 1234567 Sitename , ... (1 Reply)
Discussion started by: drheams
1 Replies

2. Programming

Regular Expression matching in PERL

I am trying to read a file and capture particular lines into different strings: LENGTH: Some Content here TEXT: Some Content Here COMMENT: Some Content Here I want to be able to get (LENGTH: .... ) into one array and so on... I'm trying to use PERL in slurp mode but for some reason... (8 Replies)
Discussion started by: Legend986
8 Replies

3. Shell Programming and Scripting

Help: Regular Expression for Negate Matching String

Hi guys, as per subject I am having problem with regular expressions. Example, if i got a string "javax.servlet.http.HttpServlet.service" that may occurred anywhere within a text file. How can I used the negate pattern matching of regular expression? I tried the below pattern but it... (4 Replies)
Discussion started by: DrivesMeCrazy
4 Replies

4. Shell Programming and Scripting

Regular expression matching in BASH (equivalent of =~ in Perl)

In Perl I can write a condition that evaluates a match expression like this: if ($foo =~ /^bar/) { do blah blah blah } How do I write this in shell? What I need to know is what operator do I use? The '=~' doesn't seem to fit. I've tried different operators, I browsed the man page for... (3 Replies)
Discussion started by: indiana_tas
3 Replies

5. Shell Programming and Scripting

Matching single quote in a regular expression

I trying to match the begining of the following line in a perl script with a regular expression. $ENV{'ORACLE_HOME'} I tried this regluar expession: /\$ENV\{\'ORACLE_HOME\'\}/ Instead of match, I got a blank prompt > It seems to be a problem with the single quote. If I take it... (11 Replies)
Discussion started by: JC9672
11 Replies

6. Shell Programming and Scripting

Hidden Characters in Regular Expression Matching Perl - Perl Newbie

I am completely new to perl programming. My father is helping me learn said programming language. However, I am stuck on one of the assignments he has given me, and I can't find very much help with it via google, either because I have a tiny attention span, or because I can be very very dense. ... (4 Replies)
Discussion started by: kittyluva2
4 Replies

7. Programming

Perl: How to read from a file, do regular expression and then replace the found regular expression

Hi all, How am I read a file, find the match regular expression and overwrite to the same files. open DESTINATION_FILE, "<tmptravl.dat" or die "tmptravl.dat"; open NEW_DESTINATION_FILE, ">new_tmptravl.dat" or die "new_tmptravl.dat"; while (<DESTINATION_FILE>) { # print... (1 Reply)
Discussion started by: jessy83
1 Replies

8. UNIX for Dummies Questions & Answers

delete lines matching a regular expression

I have a very large file (over 700 million lines) that has some lines that I need to delete. An example of 5 lines of the file: HS4_80:8:2303:19153:193032 153 k80:138891 HS4_80:8:2105:5544:43174 89 k88:81949 165 k88:81949 323 0 * = 323 0 ... (6 Replies)
Discussion started by: pathunkathunk
6 Replies

9. Shell Programming and Scripting

regular expression matching whole words

Hi Consider the file this is a good line when running grep '\b(good|great|excellent)\b' file5 I expect it to match the line but it doesn't... what am i doing wrong?? (ultimately this regex will be in a awk script- just using grep to test it) Thanks, Storms (5 Replies)
Discussion started by: Storms
5 Replies

10. UNIX for Advanced & Expert Users

sed: -e expression #1, char 0: no previous regular expression

Hello All, I'm trying to extract the lines between two consecutive elements of an array from a file. My array looks like: problem_arr=(PRS111 PRS213 PRS234) j=0 while } ] do k=`expr $j + 1` sed -n "/${problem_arr}/,/${problem_arr}/p" problemid.txt ---some operation goes... (11 Replies)
Discussion started by: InduInduIndu
11 Replies
VAR_EXPORT(3)								 1							     VAR_EXPORT(3)

var_export - Outputs or returns a parsable string representation of a variable

SYNOPSIS
mixed var_export (mixed $expression, [bool $return = false]) DESCRIPTION
var_export(3) gets structured information about the given variable. It is similar to var_dump(3) with one exception: the returned represen- tation is valid PHP code. PARAMETERS
o $expression - The variable you want to export. o $return - If used and set to TRUE, var_export(3) will return the variable representation instead of outputting it. RETURN VALUES
Returns the variable representation when the $return parameter is used and evaluates to TRUE. Otherwise, this function will return NULL. NOTES
Note When the $return parameter is used, this function uses internal output buffering so it cannot be used inside an ob_start(3) callback function. CHANGELOG
+--------+---------------------------------------------------+ |Version | | | | | | | Description | | | | +--------+---------------------------------------------------+ | 5.1.0 | | | | | | | Possibility to export classes and arrays con- | | | taining classes using the __set_state() magic | | | method. | | | | +--------+---------------------------------------------------+ EXAMPLES
Example #1 var_export(3) Examples <?php $a = array (1, 2, array ("a", "b", "c")); var_export($a); ?> The above example will output: array ( 0 => 1, 1 => 2, 2 => array ( 0 => 'a', 1 => 'b', 2 => 'c', ), ) <?php $b = 3.1; $v = var_export($b, true); echo $v; ?> The above example will output: 3.1 Example #2 Exporting classes since PHP 5.1.0 <?php class A { public $var; } $a = new A; $a->var = 5; var_export($a); ?> The above example will output: A::__set_state(array( 'var' => 5, )) Example #3 Using __set_state() (since PHP 5.1.0) <?php class A { public $var1; public $var2; public static function __set_state($an_array) { $obj = new A; $obj->var1 = $an_array['var1']; $obj->var2 = $an_array['var2']; return $obj; } } $a = new A; $a->var1 = 5; $a->var2 = 'foo'; eval('$b = ' . var_export($a, true) . ';'); // $b = A::__set_state(array( // 'var1' => 5, // 'var2' => 'foo', // )); var_dump($b); ?> The above example will output: object(A)#2 (2) { ["var1"]=> int(5) ["var2"]=> string(3) "foo" } NOTES
Note Variables of type resource couldn't be exported by this function. Note var_export(3) does not handle circular references as it would be close to impossible to generate parsable PHP code for that. If you want to do something with the full representation of an array or object, use serialize(3). Warning When var_export(3) exports objects, the leading backslash is not included in the class name of namespaced classes for maximum com- patibility. SEE ALSO
print_r(3), serialize(3), var_dump(3). PHP Documentation Group VAR_EXPORT(3)
All times are GMT -4. The time now is 02:12 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy