Hello
I am trying save a value from an input tag in some HTML source code.
The tag looks like so:
<input name="user_status" value="3" />
I have the page source in a variable (pageSourceCode), and need to work out some regex to get the value (3 in this example).
I have this so far:
Dim sCapture As String = System.Text.RegularExpressions.Regex.Match(pageSourceCode, "\<input\sname\=\""user_status\""\svalue\=\""(.*)?\""\>").Groups(1).Value
Which works fine most of the time, however this code is used to process source code from multiple sites (that use the same platform), and sometimes there are other attributes included in the input tag, or they are in a different order, eg:
<input class="someclass" type="hidden" value="3" name="user_status" />
I just dont understand regex enough to cope with these situations.
Any help very much appreciated.
PS Although i am looking for a specific answer to this question if at all possible, a pointer to a good regex tutorial would be great as well
Thanks
You can search for <input[^>]*\bvalue="([^"]+)" if your input tags never contain angle brackets.
[^>]* matches any number of characters except > which keeps the regex from accidentally matching across tags.
\b ensures that we only match value and not something like x_value.
EDIT:
If you only want to look at input tags where name="user_status", then you can do this with an additional lookahead assertion:
<input(?=[^>]*name="user_status")[^>]*\bvalue="([^"]+)"
In VB.NET:
ResultString = Regex.Match(SubjectString, "<input(?=[^>]*user_status=""name"")[^>]*\bvalue=""([^""]+)").Groups(1).Value
A good tutorial can be found at http://www.regular-expressions.info
Assuming this is an ASP.Net page and not some external HTML you can't control the better solution would be simply to access the control.
Add an ID field to your input control and a runat="server" like this.
<input id="user_status" runat="server" class="someclass" type="hidden" value="3" name="user_status" />
You can probably get rid of the Name field. It's typically the same as the ID field and ID is a better choice. You can actually have both an ID and Name field if you want and they can both be the same value.
In your code behind you can then access the value by the ID with no need for a regex.
Me.user_status.value
Related
I'm aware that parsing numbers with pure CSS is impossible. But as in my case I know for certain that the input will always be in a specific way, is it possible to change the display of an input field based on the count of characters in it?
e.G. I want '123450' to be displayed as '1,234.50' - or if it were 'abcdef' it should become 'a,bcd.ef'.
So, I would like a rule that says: from right to left: after the second char display a dot, after the fifth and eight char display a comma.
Is that possible?
Example:
<input type="text" class="unformatted" value="123456" />
Should display like
<input type="text" class="formatted" vaulue="1,234.56" />
while still retaining its original value 123456.
What you're asking is not possible with pure CSS. The smallest you can go with CSS is the single HTML tag, you cannot go deeper than that.
Individual lines of text cannot be selected or altered, as they are seen as a whole by CSS engine.
With a little help from JavaScript, however, this can be easily done.
I'm sure someone will mark this as a duplicate question but no other answers worked for me.
I am using ruby and passing a variable into my html page. Let's say my variable "camp_name" is equal to "abc'd"
<%=camp_name%>
This outputs "abc'd" which is what I want.
<input type="text" class="form-control" name="campaign_name" required value='<%=camp_name%>'>
The value in the field is now "abc" because of the single apostrophe. How do i get it to ignore apostrophes? Thanks.
You can escape the variable to html entities:
camp_name.gsub("'", "'")
You should do that for other characters as well, because, as mentioned by a comment, the user could simply insert an HTML tag in your page with your current script. Probably the most important ones are the following:
camp_name.gsub("<", "<")
camp_name.gsub(">", ">")
If you're using Rack (which would definitely be in use if you're using Rails or Sinatra, and it might be there even if you're not), there is a builtin for escaping HTML for just this kind of thing. Calling Rack::Utils#escape_html will replace ampersands, brackets, and quotes with their HTML entities (e.g. ' instead of ').
In your case, you'd want the following code:
<input type="text" class="form-control" name="campaign_name" required value='<%= Rack::Utils.escape_html(camp_name) %>'>
This would evaluate to:
<input type="text" class="form-control" name="campaign_name" required value='abc'd'>
which is the proper way of displaying an apostrophe in HTML.
Just as a side note, displaying user-submitted text without escaping on a website is a very bad idea, because malicious users can add arbitrary Javascript that could render your site useless, add advertisements, and more. You should definitely get into the habit of escaping any text that users can submit before displaying it, either by gsubing manually or using a helper method like this.
I can't seem to get the pattern attribute to work for the HTML form validation. I have seen a lot of tutorials and it all says the same and it works for them. Though I am using the same technique as the tutorials, I can't get it to work. For an example, please see the below code.
<label for= "firstname" id="firstname">First Name*</label>
<input type="text" name="firstname" pattern="[A-Za-z]" title="Only Alphabets" required/>
I want only alphabets to be inserted into this text box. When I insert numerals, it does ask to match the requested format which is only alphabets. But even when I enter alphabets it shows the message though it is supposed to let me submit the form. I tried all I can but can't seem to find a solution for this due my lack of knowledge. I would really appreciate if you could let me know how to enter only numbers into a field, only alphabets into a field, numbers and alphabets into a field using the pattern attribute for validation. Moreover, I was wondering whether the pattern attribute would be able to help me with this as well. For the National ID text box, I want the user to insert data in a specific format. Like this "A000000". An A in the first followed by 6 digits and if this format is not followed, then to display the message asking to match the requested format. Thank you so much in advance. (Please keep note that I am not using jquery).
Edit
May I please know how to add ' (apostrophe) along with the alphabets? Moreover pattern="[A-Za-z]+" wont let me insert spaces between words. How do I fix that?
The pattern field uses regular expressions. Try:
pattern="[A-Za-z]+"
For the national ID you could use:
pattern="A[0-9]{6}"
I'm working on a simple check for my input fields. I got 3 places where I'm validating user-input: javascript regex, html pattern and php regex. The Javascript and PHP part work fine, but my HTML pattern somehow returns an error for every input except blank. I tested it on regexpal.com (regex tester) and it works perfectly fine there, so I reckon I must be doing something wrong.
Here's my regex:
/^[a-zA-Z0-9\!\?\,\.\s]{0,50}$/
I'm trying to allow users to input the following:
Alphabetic characters, including capitals
Numeric characters
Puncation: exclamation(!), question(?), comma(,) and dot(.)
Spaces
Here's how I implement it:
<input type="text" id="name" name="name" aria-required="true" pattern="/^[a-zA-Z0-9\!\?\,\.\s]{0,50}$/" value="loaded value from db">
Please note: I'm allowing 0 characters to be entered because I will check it with PHP, and if the input field(s) is/are empty, a pre-set value will be written to the database.
Basically it should allow users to enter general words or sentences, but somehow it doesn't allow anything. The only way I don't get an "error" is when I leave the inputfield blank. What am I doing wrong? Is my regex wrong? Am I not implementing it correctly? I can provide more code if necessary.
Help is much appreciated!
Thanks in advance.
Try removing the forward slashes (/) from the input's pattern attribute.
To get additional ID information (like the page name) about the page when it's submitted.
Thanks
No, it shouldn't matter, as long as it is within the form.
It must be within the form. It doesn't matter where, unless you do something like this:
<form>
<input type="text" name="data[]" value="value1" />
<input type="hidden" name="data[]" value="value2" />
<input type="text" name="data[]" value="value3" />
</form>
In this case the data array isn't associative, so the position of the elements does matter.
Similarily, if you'd traverse your POST / GET data with a foreach loop without paying attention to the array keys, you could get problems (but if you have an associative array, you should use the associations, especially in user input).
I mention these things just to make the answer more complete. In most cases the simple answer applies - position of hidden fields does not matter.
No. Values from an HTML form are mostly treated as being an associative array. To that end, the order in which the elements appear are of hardly any concern.
It matters in the sense that the order of data fields in submitted form data normally corresponds to the order of fields in HTML markup. You can see this easily if you use the default method (GET), so that the fields will appear in the URL.
There is no requirement on this; it is just how browsers tend to behave. Any robust form data processing does not count on any particular order.
I have sometimes observed browser rendering oddities that seemed to depend on the placement of hidden fields. It sounds weird, because hidden fields should not affect rendering.