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Shell Programming and Scripting
Perl Pattern Matching:Unix Vs. Window (Is it OS dependent??)
Post 302306825 by Niroj on Tuesday 14th of April 2009 12:37:53 AM
04-14-2009
Thanks KevinADC & jim mcnamara !
Actually I am reading a dbscript file which contains the SQL statements like "SELECT emp_id FROM EMPLOYEE......;" , " UPDATE ..........;" etc including the other comments & unrelated things. I want to get get those queries using pattern matching.
like:
$count= 0;
while ( my $line = <FH0>)
{
if ($line =~ m/^[ ]*UPDATE[ ]+/i)
{
print "UPDATE----line no.= $line_no:\n----\n\n$line\n";
$line_no=$count++;
}
}
=======
In the above script I m checking the lines those are starting with the SQL keywords. Though it is working with the other lines correctly but failing for some lines like
"UPDATE ABCD....". (all I checked in UNIX os)
When I coping the exact query in Window os & tested this it failing again. But strange thing is that when I am writing the same thing with out copying, then pattern matching is successful both in unix and window.
So, I concluded that may be there is some problem while reading the file where I am searching the sql statements by pattern matching. May be some corrupt or invisible characters.
Did u get me? Why it is happening...? Anyway to avoid such things..?
Actually I am reading a dbscript file which contains the SQL statements like "SELECT emp_id FROM EMPLOYEE......;" , " UPDATE ..........;" etc including the other comments & unrelated things. I want to get get those queries using pattern matching.
like:
$count= 0;
while ( my $line = <FH0>)
{
if ($line =~ m/^[ ]*UPDATE[ ]+/i)
{
print "UPDATE----line no.= $line_no:\n----\n\n$line\n";
$line_no=$count++;
}
}
=======
In the above script I m checking the lines those are starting with the SQL keywords. Though it is working with the other lines correctly but failing for some lines like
"UPDATE ABCD....". (all I checked in UNIX os)
When I coping the exact query in Window os & tested this it failing again. But strange thing is that when I am writing the same thing with out copying, then pattern matching is successful both in unix and window.
So, I concluded that may be there is some problem while reading the file where I am searching the sql statements by pattern matching. May be some corrupt or invisible characters.
Did u get me? Why it is happening...? Anyway to avoid such things..?
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LEARN ABOUT PHP
gmatch
gmatch(3GEN) String Pattern-Matching Library Functions gmatch(3GEN) NAME
gmatch - shell global pattern matching SYNOPSIS
cc [ flag ... ] file ... -lgen [ library ... ] #include <libgen.h> int gmatch(const char *str, const char *pattern); DESCRIPTION
gmatch() checks whether the null-terminated string str matches the null-terminated pattern string pattern. See the sh(1), section File Name Generation, for a discussion of pattern matching. A backslash () is used as an escape character in pattern strings. RETURN VALUES
gmatch() returns non-zero if the pattern matches the string, zero if the pattern does not. EXAMPLES
Example 1: Examples of gmatch() function. In the following example, gmatch() returns non-zero (true) for all strings with "a" or "-" as their last character. char *s; gmatch (s, "*[a-]" ) ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |MT-Level |MT-Safe | +-----------------------------+-----------------------------+ SEE ALSO
sh(1), attributes(5) NOTES
When compiling multithreaded applications, the _REENTRANT flag must be defined on the compile line. This flag should only be used in mul- tithreaded applications. SunOS 5.10 29 Dec 1996 gmatch(3GEN)