Preg stuff

[mpsn]

Hi, if I wanted a form field in my website to have at most 90 alphabet characters, would this be approrpriate:

 

/(a-zA-Z){90}/

[litebearer]

Did you test it?

[blacknight]

preg_match('/[^a-zA-Z]{1,90}/i',$field)

 

should allow 1-90 letters no spaces or numbers or other none letter chars

[Pikachu2000]

Why even bother with a regex pattern for that?

 

if( ctype_alpha($field) && strlen($field) <91 )

[mpsn]

preg_match('/[^a-zA-Z]{1,90}/i',$field)

 

should allow 1-90 letters no spaces or numbers or other none letter chars

 

but isn't the '^' inside the sqr brace mean NOT any alphabets

[mpsn]

How do I make a reg expression for email validation? This is what I have:

 

/(\da-zA-Z)+@(\da-zA-Z)+\.(a-ZA-Z)+/

 

So it says, check one or more of digits, alphabets, followed by @, followed by one or more digits,alphabets, followed by '.', followed by one or more alphabets, but it's not working. I'm using a forms plugin in WordPress, and we have to enter our own reg expressions.

 

Any help for my approach is appreciated.

[Pikachu2000]

filter_var('address@domain.com', FILTER_VALIDATE_EMAIL);

[mpsn]

I'm using a WordPress Contact Forms plugin, and it expects a regular expression, so can you let me know what I'm doing wrong with my approach

 

Cheers

[AyKay47]

How do I make a reg expression for email validation? This is what I have:

 

/(\da-zA-Z)+@(\da-zA-Z)+\.(a-ZA-Z)+/

 

So it says, check one or more of digits, alphabets, followed by @, followed by one or more digits,alphabets, followed by '.', followed by one or more alphabets, but it's not working. I'm using a forms plugin in WordPress, and we have to enter our own reg expressions.

 

Any help for my approach is appreciated.

 

That is not what that regex says at all. You do not have your characters grouped in character classes. [a-zA-Z\d]

The regex that you have is not doing what you think it is, and no valid email will pass that.

[mpsn]

Then what is round brackets for, and isn't square brackets imply OR, so [a-zA-Z\d]+ would mean one or more lower case a to z OR one or more upper case A to Z OR one or more digits?

[mpsn]

I tried this, it's still now working (for email validation)

 

/[\da-zA-Z]+@[\da-zA-Z]+\.[a-ZA-Z]+/

[Zane]

Then what is round brackets for, and isn't square brackets imply OR, so [a-zA-Z\d]+ would mean one or more lower case a to z OR one or more upper case A to Z OR one or more digits?

What are "round brackets"?  I'm assuming you mean parentheses....

Parentheses are used to consolidate a regex search.  For instance, if you wanted to go through

and grab the name, class, and value as separate entities....

then you'd use parenthesis for each one.

 

The braces do not mean OR,,, they are used for ranges.. For example

[1-9A-Za-Z@%!]

Would only match something that had either of the characters.

453ABCzyx@@@%!!!!!  // Would match

453ABCzyx@@@%!!!!!$$  //Would not match because the $ is not within the range.

02356985  //Would not match because the numeric range is 1-9

[mpsn]

so what am i doing wrong w. my approach for email validation:

 

/[\da-zA-Z]+@[\da-zA-Z]+\.[a-ZA-Z]+/

[AyKay47]

That pattern will match a standard email. But will also match things like test@test.helooooooooooooooooooooo (which apparently the code in this forum will match)

which clearly is not an email.

Also, there are numerous characters that are valid in email addresses that you have left out of your pattern (dashes, underscores, etc..)

post a sample string and your logic for matching the email address.

[blacknight]

preg_match("/^[\.A-z0-9_\-\+]+[@][A-z0-9_\-]+([.][A-z0-9_\-]+)+[A-z]{1,4}$/", $str);

will match an email

 

http://www.addedbytes.com/cheat-sheets/regular-expressions-cheat-sheet-version-1/

this is a regex cheet sheet that i use explanes alot of stuff...

[AyKay47]

preg_match("/^[\.A-z0-9_\-\+]+[@][A-z0-9_\-]+([.][A-z0-9_\-]+)+[A-z]{1,4}$/", $str);

will match an email

 

http://www.addedbytes.com/cheat-sheets/regular-expressions-cheat-sheet-version-1/

this is a regex cheet sheet that i use explanes alot of stuff...

 

not to be rude, but that is one of the  grossest email regex I have seen in a while.

There are so many things wrong with it that I'm not even sure where to start.

That regex would match an "email" like test@test.com.com.com.com.com.com.org.co

This is one I like to use:

 

~^[a-z0-9._%+-]+@[a-z0-9.-]+\.[a-z]{2,4}$~i

 

depending on the context you could wrap it in word boundaries instead of anchors.

[blacknight]

yes but not all eamils are just i dot extention my old school one was @unb.nb.gc.ca ....

 

on the php manual some one cretaed this function

http://www.php.net/manual/en/function.preg-match.php#105542

looks complex but validates the entier address peace by peace

[mpsn]

i'll try it out thx