On my website, after a user registers they can change their username at any time. The minimum amount of characters is 6 and max amount is 25.
Here's some of the coding to check the length and remove characters:
$users_new_name = strip_tags($_POST['new_name']);
$new_name = preg_replace("/[^0-9a-zA-Z -]/", "", $users_new_name);
// Check Length
if (ctype_space($new_name)) {
$message = die('<span class="Fail">Error: Name Must Be At least 6 Characters Long!</i></span>');
}
if(strlen($new_name) < 6) {
$message = die('<span class="Fail">Error: Name Must Be At least 6 Characters Long!</i></span>');
}
if(strlen($new_name) > 25) {
$message = die('<span class="Fail">Error: Name Can\'t Be More Than 25 Characters Long!</i></span>');
}
The issue I'm having is if you type in 5 spaces and then a letter or number, There new name will be that letter or number; Or if you type in a letter or number then 5 spaces. How could I prevent this from happening?
Here's a screenshot of the example
I do not understand why tags would be in a POST.
Spaces becomes a non-issue if you change:
$users_new_name = strip_tags($_POST['new_name']);
To
$users_new_name = trim(strip_tags($_POST['new_name']));
Or ideally (strip tags is unnecessary):
$users_new_name = trim($_POST['new_name']);
Change the RegEx expression to /[^0-9a-zA-Z]/ to eliminate spaces and dashes.
It sounds like you need trim() to trim any spaces from the username. See http://php.net/trim
ltrim() will trim any leading spaces. rtrim() will trim any spaces at the end of the string.
This is fairly simple and it's something I've had to deal with on systems before.
If you make the first thing you call, this preg_replace, the rest of you code should catch it;
$name = preg_replace('~[\s]+~', '', $name);
This simply checks if there is a space, or more than one, then replaces with a single space.
So " l" would return " l" - failing your 5 character minimum.
Use trim() around this and you should have it working to something acceptable (Depending on your definition of acceptable - worked in my use-case)
Related
I set formatting mask on a textfield :
$(document).ready(function() {
$("#budget_para_prevision").inputmask("9999999999999.99"); // 13 digits before "."
});
The problem happens after posting the form when the length of the digits before the "." sign is less than 13 then the formatting characters are written automatically with the $_POST variable , it gives something like this :
391000000000_.__
So how to remove the _ and the . sign in this case ?
You can remove the unwanted characters using a combination of str_replace and rtrim. Something like this:
$input = "391000000000_.__";
$result = str_replace("_", "", $input); // Remove instances of underscore.
$result = rtrim($result, "."); // Remove the dot if it's the last character.
Or you can just do the whole lot with a single rtrim:
$result = rtrim($input, "._");
You can have part of your mask be optional. Anything listed after '?'
within the mask is considered optional user input. The common example
for this is phone number + optional extension.
$(document).ready(function() {
//if 12 and more digits are optional
$("#budget_para_prevision").inputmask("999999999999?9.99");
});
From docs
I guess it would depend on what jQuery inputmask plugin you are using exactly, but if it is Robin Herbots plugin, you can make parts of your input optional and specify lengths:
$(document).ready(function() {
$("#budget_para_prevision").inputmask("9{1,13}[.99]"); // 13 digits before "."
});
Of course you could also fix it at the backend with rtrim($input, "._") but preventing the input in the first place would be better.
I have phone numbers that I want to format
And I have a pattern matcher that breaks down the numbers into a 10 digit format, and then applies dashes.
It works most of the time. However Im having an issue with certain numbers.
$trimmed = trim(preg_replace('/\s+/', '', $v->cust_num));
$tendigit = str_replace(array( '(', ')','-',' ' ), '', $trimmed);
$num = substr($tendigit,0,3)."-".substr($tendigit,3,3)."-".substr($tendigit,6,4);
This will change (555)555 5555, or 555-555 5555 or 5555555555 or (555)-555-5555 or 555-555-5555
to my format of 555-555-5555
However, I came across a few entries in my database, that dont seem to want to change.
One of the bad entries is this one. It contains two white spaces infront of the 4.
4-035-0100
When it runs through $trimmed, and I output $tendigit...it outputs
40350100
as expected. But then when I apply $num to it. It goes back to
4-035-0100
I would at least expect it to be
403-501-00
It seems there is some hidden whitespace in it, that my preg_replace, trim, and str_replace are not attacking.
Any ideas??
Thanks
The code below works, I have tried it with the special characters we discovered in the comments. Basically, the regex removes everything that isnt a number (0-9) and then uses your original formatting.
$trimmed = preg_replace('/\D+/', '', $v->cust_num);
$num = substr($trimmed,0,3)."-".substr($trimmed,3,3)."-".substr($trimmed,6,4);
You can condense your code a little:
$tendigit = preg_replace('/[^\d]/', '', $v->cust_num);
$num = substr($tendigit,0,3)."-".substr($tendigit,3,3)."-".substr($tendigit,6,4);
Though, you should add in some conditions to check that the phone number actually has 10 digits too:
$tendigit = preg_replace('/[^\d]/', '', $v->cust_num);
if(strlen($tendigit == 10)){
$num = substr($tendigit,0,3)."-".substr($tendigit,3,3)."-".substr($tendigit,6,4);
} else {
// catch your error here, eg 'please enter 10 digits'
}
The first line removes any 'non-digit' [^\d].
The conditional statement checks if the $tendigit variable has 10 digits in it.
If it does, then it uses your code to parse and format.
If it doesnt, then you can catch an error.
I need to erase all comments in $string which contains data from some C file.
The thing I need to replace looks like this:
something before that shouldnt be replaced
/*
* some text in between with / or * on many lines
*/
something after that shouldnt be replaced
and the result should look like this:
something before that shouldnt be replaced
something after that shouldnt be replaced
I have tried many regular expressions but neither work the way I need.
Here are some latest ones:
$string = preg_replace("/\/\*(.*?)\*\//u", "", $string);
and
$string = preg_replace("/\/\*[^\*\/]*\*\//u", "", $string);
Note: the text is in UTF-8, the string can contain multibyte characters.
You would also want to add the s modifier to tell the regex that .* should include newlines. I always think of s to mean "treat the input text as a single line"
So something like this should work:
$string = preg_replace("/\\/\\*(.*?)\\*\\//us", "", $string);
Example: http://codepad.viper-7.com/XVo9Tp
Edit: Added extra escape slashes to the regex as Brandin suggested because he is right.
I don't think regexp fit good here. What about wrote a very small parse to remove this? I don't do PHP coding for a long time. So, I will try to just give you the idea (simple alogorithm) I haven't tested this, it's just to you get the idea, as I said:
buf = new String() // hold the source code without comments
pos = 0
while(string[pos] != EOF) {
if(string[pos] == '/') {
pos++;
while(string[pos] != EOF)
{
if(string[pos] == '*' && string[pos + 1] == '/') {
pos++;
break;
}
pos++;
}
}
buf[buf_index++] = string[pos++];
}
where:
string is the C source code
buf a dynamic allocated string which expands as needed
It is very hard to do this perfectly without ending up writing a full C parser.
Consider the following, for example:
// Not using /*-style comment here.
// This line has an odd number of " characters.
while (1) {
printf("Wheee!
(*\/*)
\\// - I'm an ant!
");
/* This is a multiline comment with a // in, and
// an odd number of " characters. */
}
So, from the above, we can see that our problems include:
multiline quote sequences should be ignored within doublequotes. Unless those doublequotes are part of a comment.
single-line comment sequences can be contained in double-quoted strings, and in multiline strings.
Here's one possibility to address some of those issues, but far from perfect.
// Remove "-strings, //-comments and /*block-comments*/, then restore "-strings.
// Based on regex by mauke of Efnet's #regex.
$file = preg_replace('{("[^"]*")|//[^\n]*|(/\*.*?\*/)}s', '\1', $file);
try this:
$string = preg_replace("#\/\*\n?(.*)\*\/\n?#ms", "", $string);
Use # as regexp boundaries; change that u modifier with the right ones: m (PCRE_MULTILINE) and s (PCRE_DOTALL).
Reference: http://php.net/manual/en/reference.pcre.pattern.modifiers.php
It is important to note that my regexp does not find more than one "comment block"... Use of "dot match all" is generally not a good idea.
For my PHP script I have this code:
if (!preg_match("/[^A-Za-z]/", $usersurname))
$usersurname_valid = 1;
This worked untill I realized a surname can be two or more words... doh.
Anyone can tell me how to write this code if I want to allow 1 space between two worlds? For example:
Jan Klaas is now wrong and Jan Klaas should be allowed, also Jan Klaas Martijn and so on should be allowed.
Even better would be a preg replace, to replace two or more spaces with 1, so when you write: Jan(space)(space)Klaas or Jan(space)(space)(space)(space)Klaas, it would return Jan(space)Klaas.
I searched around for a while but somehow I just can't get this space matching to work..
PS: When I got this working, I will apply this for the mid and last name too ofcourse.
===========================================
EDIT: After you helping me out, I re-wrote my code to:
// validate usersurname
$usersurname = preg_replace("/\s{2,}/"," ", $usersurname);
if (!preg_match("/^[A-Za-z]+(\s[A-Za-z]+)*$/",$usersurname))
$usersurname_valid = 1;
// validate usermidname
$usermidname = preg_replace("/\s{2,}/"," ", $usermidname);
if (!preg_match("/^[A-Za-z]+(\s[A-Za-z]+)*$/",$usermidname))
$usermidname_valid = 1;
// validate userforename
$userforename = preg_replace("/\s{2,}/"," ", $userforename);
if (!preg_match("/^[A-Za-z]+(\s[A-Za-z]+)*$/",$userforename))
$userforename_valid = 1;
and the error notifications
elseif ($usersurname_valid !=1)
echo ("<p id='notification'>Only alphabetic character are allowed for the last name. $usersurname $usermidname $userforename</p>");
// usermidname character validation
elseif ($usermidname_valid !=1)
echo ("<p id='notification'>Only alphabetic character are allowed for the middle name. $usersurname $usermidname $userforename</p>");
// userforename character validation
elseif ($userforename_valid !=1)
echo ("<p id='notification'>Only alphabetic character are allowed for the (EDIT) first name. $usersurname $usermidname $userforename</p>");
Replacing the spaces are working well and I need this preg_match to check on on A-Za-z + space. I think in this case it doesn't matter if it's matching more than 1 spaces because it's replaced anyway, right?
EDIT:
Solution for my case:
$usersurname = preg_replace("/\s{2,}/"," ", $usersurname);
if (!preg_match("/[^A-Za-z ]/", $usersurname))
This does the work. Thanks for helping out, J0HN
Well, solving the problem you have in mind:
if (!preg_match("/^[A-Za-z]+(\s[A-Za-z]+)*$/",$usersurname)) { ... }
But, well, it's just a part of the solution, and it's not bulletproof. Look at the list of common mistakes when handling names.
So, you'd better to re-think on your validation approach.
Replacing the multiple spaces is simpler to achieve as a separate instruction, something like
$processed_usersurname = preg_replace("/\s{2,}/"," ", $usersurname);
This will match and replace any two or more consequent whitespace characters (space, tab, linebreak and carriage return) to single space
Sorry for the title, I really didn't know how to say this...
I often have a string that needs to be cut after X characters, my problem is that this string often contains special characters like : & egrave ;
So, I'm wondering, is their a way to know in php, without transforming my string, if when I am cutting my string, I am in the middle of a special char.
Example
This is my string with a special char : è - and I want it to cut in the middle of the "è" but still keeping the string intact
so right now my result with a sub string would be :
This is my string with a special char : &egra
but I want to have something like this :
This is my string with a special char : è
The best thing to do here is store your string as UTF-8 without any html entities, and use the mb_* family of functions with utf8 as the encoding.
But, if your string is ASCII or iso-8859-1/win1252, you can use the special HTML-ENTITIES encoding of the mb_string library:
$s = 'This is my string with a special char : è - and I want it to cut in the middle of the "è" but still keeping the string intact';
echo mb_substr($s, 0, 40, 'HTML-ENTITIES');
echo mb_substr($s, 0, 41, 'HTML-ENTITIES');
However, if your underlying string is UTF-8 or some other multibyte encoding, using HTML-ENTITIES is not safe! This is because HTML-ENTITIES really means "win1252 with high-bit characters as html entities". This is an example of where this can go wrong:
// Assuming that é is in utf8:
mb_substr('é ', 0, 2, 'HTML-ENTITIES') === 'é'
// should be 'é '
When your string is in a multibyte encoding, you must instead convert all html entities to a common encoding before you split. E.g.:
$strings_actual_encoding = 'utf8';
$s_noentities = html_entity_decode($s, ENT_QUOTES, $strings_actual_encoding);
$s_trunc_noentities = mb_substr($s_noentities, 0, 41, $strings_actual_encoding);
The best solution would be to store your text as UTF-8, instead of storing them as HTML entities. Other than that, if you don't mind the count being off (` equals one character, instead of 7), then the following snippet should work:
<?php
$string = 'This is my string with a special char : è - and I want it to cut in the middle of the "è" but still keeping the string intact';
$cut_string = htmlentities(mb_substr(html_entity_decode($string, NULL, 'UTF-8'), 0, 45), NULL, 'UTF-8')."<br><br>";
Note: If you use a different function to encode the text (e.g. htmlspecialchars()), then use that function instead of htmlentities(). If you use a custom function, then use another custom function that does the opposite of your new custom function instead of html_entity_decode() (and custom function instead of htmlentities()).
The longest HTML entity is 10 characters long, including the ampersand and semicolon. If you intend to cut the string at X bytes, check bytes X-9 through X-1 for an ampersand. If the corresponding semicolon appears at byte X or later, cut the string after the semicolon instead of after byte X.
However, if you're willing to preprocess the string, Mike's solution will be more accurate because his cuts the string at X characters, not bytes.
You can use html_entity_decode() first to decode all the HTML entities. Then split your string. Then htmlentities() to re-encode the entities.
$decoded_string = html_entity_decode($original_string);
// implement logic to split string here
// then for each string part do the following:
$encoded_string_part = htmlentities($split_string_part);
A little bruteforce solution, that I'm not really happy with would a PCRE expression, let's say that you want to pass 80 characters and the longest possible HTML expression is 7 chars long:
$regex = '~^(.{73}([^&]{7}|.{0,7}$|[^&]{0,6}&[^;]+;))(.*)~mx'
// Note, this could return a bit of shorter text
return preg_replace( $regexp, '$1', $text);
Just so you know:
.{73} - 73 characters
[^&]{7} - okay, we may fill it with anything that doesn't contain &
.{0,7}$ - keep in mind the possible end (this shouldn't be necessary because shorter text wouldn't match at all)
[^&]{0,6}&[^;]+; - up to 6 characters (you'd be at 79th), then & and let it finish
Something that seems much better but requires bit of play with numbers is to:
// check whether $text is at least $N chars long :)
if( strlen( $text) < $N){
return;
}
// Get last &
$pos = strrpos( $text, '&', $N);
// We're not young anymore, we have to check this too (not entries at all) :)
if( $pos === false){
return substr( $text, 0, $N);
}
// Get Last
$end = strpos( $text, ';', $N);
// false wouldn't be smaller then 0 (entry open at the beginning
if( $end === false){
$end = -1;
}
// Okay, entry closed (; is after &)(
if( $end > $pos){
return substr($text, 0, $N);
}
// Now we need to find first ;
$end = strpos( $text, ';', $N)
if( $end === false){
// Not valid HTML, not closed entry, do whatever you want
}
return substr($text, 0, $end);
Check numbers, there may be +/-1 somewhere in indexes...
I think you would have to use a combination of strpos and strrpos to find the next and previous spaces, parse the text between the spaces, check that against a known list of special characters, and if it matches, extend your "cut" to the position of the next space. If you had a code sample of what you have now, we could give you a better answer.