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Full Discussion: Regular Expressions
Top Forums Shell Programming and Scripting Regular Expressions Post 302367313 by DavidHe on Monday 2nd of November 2009 08:09:55 AM
Old 11-02-2009
Power Regular Expressions

Code:
#!/usr/bin/perl


$word = "one last challenge";


if ( $word  =~ /^(\w+).*\s(\w+)$/ )
{
	print "$1";
	print "\n";
	print "$2";

}

The output shows that "$1" is with result one and "$2" is with result challenge. I am confused about how this pattern match expression works step by step. I request u guys` explanation. Thank u very much.

Last edited by pludi; 11-02-2009 at 09:57 AM.. Reason: code tags, please...
 

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sasl_checkapop(3SASL)			      Simple Authentication Security Layer Library Functions			     sasl_checkapop(3SASL)

NAME
sasl_checkapop - check an APOP challenge or response SYNOPSIS
cc [ flag ... ] file ... -lsasl [ library ... ] #include <sasl/sasl.h> int sasl_checkapop(sasl_conn_t *conn, const char *challenge, unsigned challen, const char *response, unsigned resplen); DESCRIPTION
The sasl_checkapop() interface checks an APOP challenge or response. APOP is an option POP3 authentication command that uses a shared secret password. See RFC 1939. If sasl_checkapop() is called with a NULL challenge, sasl_checkapop() will check to see if the APOP mechanism is enabled. PARAMETERS
conn The sasl_conn_t for which the request is being made challenge The challenge sent to the client challen The length of challenge response The client response resplens The length of response RETURN VALUES
sasl_checkapop() returns an integer that corresponds to a SASL error code. ERRORS
SASL_OK Indicates that the authentication is complete All other error codes indicate an error situation that must be handled, or the authentication session should be quit. See sasl_errors(3SASL) for information on SASL error codes. ATTRIBUTES
See attributes(5) for descriptions of the following attributes: +-----------------------------+-----------------------------+ | ATTRIBUTE TYPE | ATTRIBUTE VALUE | +-----------------------------+-----------------------------+ |Interface Stability |SUNWlibsasl | +-----------------------------+-----------------------------+ |Interface Stability |Obsolete | +-----------------------------+-----------------------------+ |MT-Level |Safe | +-----------------------------+-----------------------------+ SEE ALSO
sasl_errors(3SASL), attributes(5) Meyers, J. and Rose, M. RFC 1939, Post Office Protocol - Version 3. Network Working Group. May 1996. SunOS 5.11 14 Oct 2003 sasl_checkapop(3SASL)
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