I want to extract some part of a pattern that matches my requirement in a string with PERL. A case in point is a string like:
$eqtst="abh nmae res = 10 s abh nmae req = 10 s";
from which I want the words preceding the "=" symbol.
Previously I was assured that there would be only 2 such "=" symbols in a string and so I used sthg like:
$eqtst =~ /\s+(\w+)\s*=.*\s+(\w+)\s*=/
the "()" extracted the words "res", "req" into variables $1, $2 respectively. And life was good .
Now however the number of "=" symbols arent limited (might exceed 2 in a string). How do I go about extracting the words which precede "=" now?
Thanks,
Abhishek
regular expressions, though powerful, are not always the solution to a problem.
Hi,
Is there a way I can extract my data faster. You know my data is 1.2 GB text file with 8Million rows with 38 columns/fields. Imagine how huge this is.
How I can optimized the data extraction using perl. That is why I'm creating a script to filter only those informations that I need. Is... (3 Replies)
Hi all,
I have a data file from which i would like to extract only certain fields, which are not adjacent to each other. Following is the format of data file (data.txt) that i have, which has about 6 fields delimited by "|"
HARRIS|23|IT|PROGRAMMER|CHICAGO|EMP
JOHN|35|IT|JAVA|NY|CON... (2 Replies)
I have a string stored in a variable. For instance,
$str = " Opcode called is : CM_OP_xxx "
where xxx changes dynamically and can be either LOGIN or SEARCH..... depends on runtime.
For example :
$str = " Opcode called is : CM_OP_SEARCH "
$str = " Opcode called is : CM_OP_LOGIN "
I... (3 Replies)
the log contains mathematical operation as follows
fm_void_mathematics : PCM_OP_MATHS input function
PIN_FLD_NUM1 INT 1
PIN_FLD_NUM2 INT 2
PIN_FLD_RESULTS int
PIN_FLD_OUT INT *
D Wed Sep 16 05:40:22 2009 solaris_testing
fm_void_add :
PIN_FLD_SUM int 3
D Wed Sep 16 05:40:22 2009... (1 Reply)
HI,
i have variable in perl like below
$tmp="/home/sai/automation/work/TFP_GN.txt"
it can conatain any path its filled from config file.
now i want extarct the path upto this /home/sai/automation/work/ and put it in another variable
say... (4 Replies)
Hello,
I want to extract the words from a file which starts with SRD-R or SRD-DR.
I have written a script which is able to trace the word but it is printing the whole line.
sub extract_SRD_tag{
my ($tag, $app, $path, @data, $word );
$path = shift;
$app = shift;
open (FILE, $path) or... (2 Replies)
Hi,
I am using the following code to retrieve the contents between C-style comments "/* .. */".
perl -lne 'while(/(\/\*.*?\*\/)/g) {print "$1";}'
This works fine when the commented section of code is present in a single line. But I also need to extract the data which is present inside... (3 Replies)
Hi, I need to extract Password expires from the output of windows command print `net user %USERNAME% /domain`; in perl. So i want to redirect the output of this win-cmd to a file and try extracting Password expires along with its value. i'm trying with this code but getting errors.
#!usr/bin/perl... (1 Reply)
Discussion started by: sam_bd
1 Replies
LEARN ABOUT SUNOS
regex
regex(1F) FMLI Commands regex(1F)NAME
regex - match patterns against a string
SYNOPSIS
regex [-e] [ -v "string"] [ pattern template] ... pattern [template]
DESCRIPTION
The regex command takes a string from the standard input, and a list of pattern / template pairs, and runs regex() to compare the string
against each pattern until there is a match. When a match occurs, regex writes the corresponding template to the standard output and
returns TRUE. The last (or only) pattern does not need a template. If that is the pattern that matches the string, the function simply
returns TRUE. If no match is found, regex returns FALSE.
The argument pattern is a regular expression of the form described in regex(). In most cases, pattern should be enclosed in single quotes
to turn off special meanings of characters. Note that only the final pattern in the list may lack a template.
The argument template may contain the strings $m0 through $m9, which will be expanded to the part of pattern enclosed in ( ... )$0 through
( ... )$9 constructs (see examples below). Note that if you use this feature, you must be sure to enclose template in single quotes so
that FMLI does not expand $m0 through $m9 at parse time. This feature gives regex much of the power of cut(1), paste(1), and grep(1), and
some of the capabilities of sed(1). If there is no template, the default is $m0$m1$m2$m3$m4$m5$m6$m7$m8$m9.
OPTIONS
The following options are supported:
-e Evaluates the corresponding template and writes the result to the standard output.
-v "string" Uses string instead of the standard input to match against patterns.
EXAMPLES
Example 1: Cutting letters out of a string
To cut the 4th through 8th letters out of a string (this example will output strin and return TRUE):
`regex -v "my string is nice" '^.{3}(.{5})$0' '$m0'`
Example 2: Validating input in a form
In a form, to validate input to field 5 as an integer:
valid=`regex -v "$F5" '^[0-9]+$'`
Example 3: Translating an environment variable in a form
In a form, to translate an environment variable which contains one of the numbers 1, 2, 3, 4, 5 to the letters a, b, c, d, e:
value=`regex -v "$VAR1" 1 a 2 b 3 c 4 d 5 e '.*' 'Error'`
Note the use of the pattern '.*' to mean "anything else".
Example 4: Using backquoted expressions
In the example below, all three lines constitute a single backquoted expression. This expression, by itself, could be put in a menu defini-
tion file. Since backquoted expressions are expanded as they are parsed, and output from a backquoted expression (the cat command, in this
example) becomes part of the definition file being parsed, this expression would read /etc/passwd and make a dynamic menu of all the login
ids on the system.
`cat /etc/passwd | regex '^([^:]*)$0.*$' '
name=$m0
action=`message "$m0 is a user"`'`
DIAGNOSTICS
If none of the patterns match, regex returns FALSE, otherwise TRUE.
NOTES
Patterns and templates must often be enclosed in single quotes to turn off the special meanings of characters. Especially if you use the
$m0 through $m9 variables in the template, since FMLI will expand the variables (usually to "") before regex even sees them.
Single characters in character classes (inside []) must be listed before character ranges, otherwise they will not be recognized. For exam-
ple, [a-zA-Z_/] will not find underscores (_) or slashes (/), but [_/a-zA-Z] will.
The regular expressions accepted by regcmp differ slightly from other utilities (that is, sed, grep, awk, ed, and so forth).
regex with the -e option forces subsequent commands to be ignored. In other words, if a backquoted statement appears as follows:
`regex -e ...; command1; command2`
command1 and command2 would never be executed. However, dividing the expression into two:
`regex -e ...``command1; command2`
would yield the desired result.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO awk(1), cut(1), grep(1), paste(1), sed(1), regcmp(3C), attributes(5)SunOS 5.10 12 Jul 1999 regex(1F)