I am trying to work out a regular expression which will validate a
password box.
The following rules apply
Must be 8 characters
Must have at least one digit (0-9) and at least one character (a-z or
A-Z)
No special characters allowed except for full stop.
I am struggling to get to grips with regular expressions. Can anyone
help me with this please.
Thanks in anticipation
Ros Lee
14  3388 
Maybe we need to && the conditional statements with three regex patterns:
r1 = [a-zA-Z0-9]{8}
r2 = [a-zA-Z]{1,7}
r3 = [0-9]{1,7}
or just use r2 "anded" to r3 with a string length of 8.
Eg.:
option 1: (I like this one better. It has a more definitive and tighter
constraint on the string pattern compared to opt2)
if ((Regex.IsMatch (sPassword, r1)) &&
(Regex.IsMatch( sPassword, r2)) &&
(Regex.IsMatch( sPassword, r3)))
option 2:
if ((Regex.IsMatch (sPassword, r2)) &&
(Regex.IsMatch( sPassword, r3)) &&
(sPassword.Leng th == 8)) http://www.regular-expressions.info/ has a good tutorial on regex.
Try it see if either works and good luck,
/Js.
"Roz Lee" <ro**@panztel.c om> wrote in message
news:b7******** *************** *@posting.googl e.com... I am trying to work out a regular expression which will validate a
password box.
The following rules apply
Must be 8 characters
Must have at least one digit (0-9) and at least one character (a-z or
A-Z)
No special characters allowed except for full stop.
I am struggling to get to grips with regular expressions. Can anyone
help me with this please.
Thanks in anticipation
Ros Lee
Maybe we need to && the conditional statements with three regex patterns:
r1 = [a-zA-Z0-9]{8}
r2 = [a-zA-Z]{1,7}
r3 = [0-9]{1,7}
or just use r2 "anded" to r3 with a string length of 8.
Eg.:
option 1: (I like this one better. It has a more definitive and tighter
constraint on the string pattern compared to opt2)
if ((Regex.IsMatch (sPassword, r1)) &&
(Regex.IsMatch( sPassword, r2)) &&
(Regex.IsMatch( sPassword, r3)))
option 2:
if ((Regex.IsMatch (sPassword, r2)) &&
(Regex.IsMatch( sPassword, r3)) &&
(sPassword.Leng th == 8)) http://www.regular-expressions.info/ has a good tutorial on regex.
Try it see if either works and good luck,
/Js.
"Roz Lee" <ro**@panztel.c om> wrote in message
news:b7******** *************** *@posting.googl e.com... I am trying to work out a regular expression which will validate a
password box.
The following rules apply
Must be 8 characters
Must have at least one digit (0-9) and at least one character (a-z or
A-Z)
No special characters allowed except for full stop.
I am struggling to get to grips with regular expressions. Can anyone
help me with this please.
Thanks in anticipation
Ros Lee
Just out of curiousity - why use regular expressions? Your problem is
just a few lines of non-regular expression code - why not just code
it the boring old way?
Just out of curiousity - why use regular expressions? Your problem is
just a few lines of non-regular expression code - why not just code
it the boring old way?
Hi Jimi, Just out of curiousity - why use regular expressions? Your problem is
just a few lines of non-regular expression code - why not just code
it the boring old way?
I am almost writting that forever however in this case, I think it will
needs more lines.
What did you think of?
Cor
Hi Jimi, Just out of curiousity - why use regular expressions? Your problem is
just a few lines of non-regular expression code - why not just code
it the boring old way?
I am almost writting that forever however in this case, I think it will
needs more lines.
What did you think of?
Cor
I think you can use a positive lookahead to put the "and" into the regex:
"^(?=.*\d)( ?=.*[a-zA-Z])(?:.{8,})$"
I tested it only on a few cases, but it seems to work.
(I assume for password verification efficiency isn't that important)
Niki
"John Smith" <.@.> wrote in news:De******** *********@twist er.socal.rr.com ... Maybe we need to && the conditional statements with three regex patterns:
r1 = [a-zA-Z0-9]{8}
r2 = [a-zA-Z]{1,7}
r3 = [0-9]{1,7}
or just use r2 "anded" to r3 with a string length of 8.
Eg.:
option 1: (I like this one better. It has a more definitive and tighter
constraint on the string pattern compared to opt2)
if ((Regex.IsMatch (sPassword, r1)) &&
(Regex.IsMatch( sPassword, r2)) &&
(Regex.IsMatch( sPassword, r3)))
option 2:
if ((Regex.IsMatch (sPassword, r2)) &&
(Regex.IsMatch( sPassword, r3)) &&
(sPassword.Leng th == 8))
http://www.regular-expressions.info/ has a good tutorial on regex.
Try it see if either works and good luck,
/Js.
"Roz Lee" <ro**@panztel.c om> wrote in message
news:b7******** *************** *@posting.googl e.com... I am trying to work out a regular expression which will validate a
password box.
The following rules apply
Must be 8 characters
Must have at least one digit (0-9) and at least one character (a-z or
A-Z)
No special characters allowed except for full stop.
I am struggling to get to grips with regular expressions. Can anyone
help me with this please.
Thanks in anticipation
Ros Lee
I think you can use a positive lookahead to put the "and" into the regex:
"^(?=.*\d)( ?=.*[a-zA-Z])(?:.{8,})$"
I tested it only on a few cases, but it seems to work.
(I assume for password verification efficiency isn't that important)
Niki
"John Smith" <.@.> wrote in news:De******** *********@twist er.socal.rr.com ... Maybe we need to && the conditional statements with three regex patterns:
r1 = [a-zA-Z0-9]{8}
r2 = [a-zA-Z]{1,7}
r3 = [0-9]{1,7}
or just use r2 "anded" to r3 with a string length of 8.
Eg.:
option 1: (I like this one better. It has a more definitive and tighter
constraint on the string pattern compared to opt2)
if ((Regex.IsMatch (sPassword, r1)) &&
(Regex.IsMatch( sPassword, r2)) &&
(Regex.IsMatch( sPassword, r3)))
option 2:
if ((Regex.IsMatch (sPassword, r2)) &&
(Regex.IsMatch( sPassword, r3)) &&
(sPassword.Leng th == 8))
http://www.regular-expressions.info/ has a good tutorial on regex.
Try it see if either works and good luck,
/Js.
"Roz Lee" <ro**@panztel.c om> wrote in message
news:b7******** *************** *@posting.googl e.com... I am trying to work out a regular expression which will validate a
password box.
The following rules apply
Must be 8 characters
Must have at least one digit (0-9) and at least one character (a-z or
A-Z)
No special characters allowed except for full stop.
I am struggling to get to grips with regular expressions. Can anyone
help me with this please.
Thanks in anticipation
Ros Lee
> Cor Ligthertwrote:
I am almost writting that forever however in this case, I think it
will needs more lines. What did you think of? Cor
Suppose the regular expression approach takes 4 lines and 1 hour. My
approach to this trivial problem takes 12 lines and 5 minutes. This
is an easy business decision - there is no need to minimize the
number of lines of code if the tradeoff is this drastic.
I can see using regular expressions for complex problems, but it's
massive overkill for small problems. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics | |
by: Michael McGarry |
last post by:
Hi,
I am horrible with Regular Expressions, can anyone recommend a book on it?
Also I am trying to parse the following string to extract the number
after load average.
".... load average: 0.04, 0.02, 0.01"
how can I extract this number with RE or otherwise?
|
by: Kenneth McDonald |
last post by:
I'm working on the 0.8 release of my 'rex' module, and would appreciate
feedback, suggestions, and criticism as I work towards finalizing the
API and feature sets. rex is a module intended to make regular expressions
easier to create and use (and in my experience as a regular expression
user, it makes them MUCH easier to create and use.)
I'm still working on formal documentation, and in any case, such
documentation isn't necessarily the...
|
by: Sehboo |
last post by:
Hi,
I have several regular expressions that I need to run against
documents. Is it possible to combine several expressions in one
expression in Regex object. So that it is faster, or will I have to
use all the expressions seperately?
Here are my regular expressions that check for valid email address and
link
Dim Expression As String =
|
by: Együd Csaba |
last post by:
Hi All,
I'd like to "compress" the following two filter expressions into one -
assuming that it makes sense regarding query execution performance.
.... where (adate LIKE "2004.01.10 __:30" or adate LIKE "2004.01.10 __:15")
....
into something like this:
.... where adate LIKE "2004.01.10 __:(30/15)" ...
|
by: Billa |
last post by:
Hi,
I am replaceing a big string using different regular expressions (see
some example at the end of the message). The problem is whenever I
apply a "replace" it makes a new copy of string and I want to avoid
that. My question here is if there is a way to pass either a memory
stream or array of "find", "replace" expressions or any other way to
avoid multiple copies of a string.
Any help will be highly appreciated
| | |
by: a |
last post by:
I'm a newbie needing to use some Regular Expressions in PHP.
Can I safely use the results of my tests using 'The Regex Coach'
(http://www.weitz.de/regex-coach/index.html)
Are the Regular Expressions used in Perl identical to the Regular
Expressions in PHP?
|
by: Mike |
last post by:
I have a regular expression (^(.+)(?=\s*).*\1 ) that results in
matches. I would like to get what the actual regular expression is.
In other words, when I apply ^(.+)(?=\s*).*\1 to " HEART (CONDUCTION
DEFECT) 37.33/2 HEART (CONDUCTION DEFECT) WITH
CATHETER 37.34/2 " the expression is "HEART (CONDUCTION DEFECT)". How
do I gain access to the expression (not the matches) at runtime?
Thanks,
Mike
|
by: Allan Ebdrup |
last post by:
I have a dynamic list of regular expressions, the expressions don't change
very often but they can change. And I have a single string that I want to
match the regular expressions against and find the first regular expression
that matches the string.
I've gor the regular expressions ordered so that the highest priority is
first (if two or more regular expressions match the string I want the first
one returned)
The code that does this has...
|
by: Wiseman |
last post by:
I'm kind of disappointed with the re regular expressions module. In
particular, the lack of support for recursion ( (?R) or (?n) ) is a
major drawback to me. There are so many great things that can be
accomplished with regular expressions this way, such as validating a
mathematical expression or parsing a language with nested parens,
quoting or expressions.
Another feature I'm missing is once-only subpatterns and possessive
quantifiers...
|
by: FAQEditor |
last post by:
Anybody have any URL's to tutorials and/or references for Regular
Expressions?
The four I have so far are:
http://docs.sun.com/source/816-6408-10/regexp.htm
http://en.wikipedia.org/wiki/Regular_expression
http://www.regular-expressions.info/javascript.html
http://www.webreference.com/js/column5/
|
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
| | |
by: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: Hystou |
last post by:
Overview:
Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
|
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
|
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
| | |
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
|
by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
| |
