This will do:
 
    /^(apple|banana)$/

to _exclude_ from captured strings (e.g. `$1`,`$2`):

    (?:apple|banana)

Or, if you use a standalone pattern:

    apple|banana

There are different regex engines but I think most of them will work with this: 


    apple|banana

How do you convert a Unix timestamp (seconds since epoch) to Ruby DateTime?

How to convert a unix timestamp (seconds since epoch) to Ruby DateTime?

I observed that when i use Logcat with Eclipse with ADT for Android, I get messages from many other applications as well. Is there a way to filter this and show only messages from my own application only.


Filter LogCat to get only the messages from My Application in Android?

I have an input that can have only 2 values `apple` or `banana`. What regular expression can I use to ensure that either of the two words was submitted?

Regex match one of two words

<p>I have an input that can have only 2 values <code>apple</code> or <code>banana</code>. What regular expression can I use to ensure that either of the two words was submitted?</p>


&gt; **Possible Duplicate:**  
&gt; [What is the best regular expression to check if a string is a valid URL?](https://stackoverflow.com/questions/161738/what-is-the-best-regular-expression-to-check-if-a-string-is-a-valid-url)  

&lt;!-- End of automatically inserted text --&gt;

Considering a string as follows:

    string = &quot;&lt;p&gt;Hello World&lt;/p&gt;&lt;a href=&quot;http://example.com&quot;&gt;More Examples&lt;/a&gt;&lt;a href=&quot;http://example2.com&quot;&gt;Even More Examples&lt;/a&gt;&quot;

How could I, with Python, extract the urls, inside the anchor tag&#39;s href? Something like:

    &gt;&gt;&gt; url = getURLs(string)
    &gt;&gt;&gt; url
    [&#39;http://example.com&#39;, &#39;http://example2.com&#39;]

Thanks!

Regex to extract URLs from href attribute in HTML with Python

I need to perform Wildcard (`*`, `?`, etc.) search on a string.
This is what I have done:

    string input = &quot;Message&quot;;
    string pattern = &quot;d*&quot;;
    Regex regex = new Regex(pattern, RegexOptions.IgnoreCase);

    if (regex.IsMatch(input))
    {
        MessageBox.Show(&quot;Found&quot;);
    }
    else
    {
        MessageBox.Show(&quot;Not Found&quot;);
    }

With the above code &quot;Found&quot; block is hitting but actually it should not!

If my pattern is &quot;e*&quot; then only &quot;Found&quot; should hit.

My understanding or requirement is d* search should find the text containing &quot;d&quot; followed by any characters.

Should I change my pattern as &quot;d.\*&quot; and &quot;e.*&quot;? Is there any support in .NET for Wild Card which internally does it while using Regex class?


Need to perform Wildcard (*,?, etc) search on a string using Regex

I&#39;d like to use a `variable` inside a `regex`, how can I do this in `Python`?

    TEXTO = sys.argv[1]

    if re.search(r&quot;\b(?=\w)TEXTO\b(?!\w)&quot;, subject, re.IGNORECASE):
    	# Successful match
    else:
    	# Match attempt failed

How to use a variable inside a regular expression?

I&#39;m working on a routine that compares strings, but for better efficiency I need to remove all characters that are not letters or numbers.

I&#39;m using multiple `REPLACE` functions now, but maybe there is a faster and nicer solution ?

How to remove all non-alpha numeric characters from a string in MySQL?

I have got a price field to display which sometimes can be either 100 or 100.99 or 100.9, What I want is to display the price in 2 decimal places only if the decimals are entered for that price , for instance if its 100 so it should only show 100 not 100.00 and if the price is 100.2 it should display 100.20 similarly for 100.22 should be same .
I googled and came across some examples but they didn&#39;t match exactly what i wanted :

    // just two decimal places
    String.Format(&quot;{0:0.00}&quot;, 123.4567);      // &quot;123.46&quot;
    String.Format(&quot;{0:0.00}&quot;, 123.4);         // &quot;123.40&quot;
    String.Format(&quot;{0:0.00}&quot;, 123.0);         // &quot;123.00&quot;

Using String Format to show decimal up to 2 places or simple integer

I was wondering what the differences are between Select-Option and Datalist-Option.  Is there any situation in which it would be better to use one or the other?  An example of each follows:

**Select-Option**

    &lt;select name=&quot;browser&quot;&gt;
    &lt;option value=&quot;firefox&quot;&gt;Firefox&lt;/option&gt;
    &lt;option value=&quot;ie&quot;&gt;IE&lt;/option&gt;
    &lt;option value=&quot;chrome&quot;&gt;Chrome&lt;/option&gt;
    &lt;option value=&quot;opera&quot;&gt;Opera&lt;/option&gt;
    &lt;option value=&quot;safari&quot;&gt;Safari&lt;/option&gt;
    &lt;/select&gt;

**Datalist-Option**

    &lt;input type=&quot;text&quot; list=&quot;browsers&quot;&gt;
    &lt;datalist id=&quot;browsers&quot;&gt;
      &lt;option value=&quot;Firefox&quot;&gt;
      &lt;option value=&quot;IE&quot;&gt;
      &lt;option value=&quot;Chrome&quot;&gt;
      &lt;option value=&quot;Opera&quot;&gt;
      &lt;option value=&quot;Safari&quot;&gt;
    &lt;/datalist&gt;

HTML Form: Select-Option vs Datalist-Option

I&#39;m currently working on a basic form. When you hit the submit button, it should first change the value of a field, and then submit the form as usual. It all looks a bit like this:

    &lt;form name=&quot;myform&quot; id=&quot;myform&quot; action=&quot;action.php&quot;&gt;
        &lt;input type=&quot;hidden&quot; name=&quot;myinput&quot; value=&quot;0&quot; /&gt;
        &lt;input type=&quot;text&quot; name=&quot;message&quot; value=&quot;&quot; /&gt;
        &lt;input type=&quot;submit&quot; name=&quot;submit&quot; onclick=&quot;DoSubmit()&quot; /&gt;
    &lt;/form&gt;

And this is how far I&#39;ve come with the JavaScript code. It changes &quot;myinput&quot;&#39;s value to 1, but it does not submit the form.

    function DoSubmit(){
      document.myform.myinput.value = &#39;1&#39;;
      document.getElementById(&quot;myform&quot;).submit();
    }


Change value of input and submit form in JavaScript

Anyone who know how I can trigger the standard HTML5 validation in a form without using a submit button? (JavaScript or jQuery).

I do **not** want to send `POST/GET` request, only do the validation.



Trigger standard HTML5 validation (form) without using submit button?

I have ghost text in textfields that disappear when you focus on them using HTML5&#39;s placeholder attribute:

    &lt;input type=&quot;text&quot; name=&quot;email&quot; placeholder=&quot;Enter email&quot;/&gt;

I want to use that same mechanism to have multiline placeholder text in a textarea, maybe something like this:

    &lt;textarea name=&quot;story&quot; placeholder=&quot;Enter story\n next line\n more&quot;&gt;&lt;/textarea&gt;

But those `\n`s show up in the text and don&#39;t cause newlines...  Is there a way to have a multiline placeholder?

**_UPDATE_**: The only way I got this to work was utilizing the [jQuery Watermark plugin][1], which accepts HTML in the placeholder text:

    $(&#39;.textarea_class&#39;).watermark(&#39;Enter story&lt;br/&gt; * newline&#39;, {fallback: false});


  [1]: https://github.com/marioestrada/jQuery-Watermark

Can you have multiline HTML5 placeholder text in a &lt;textarea&gt;?

I have some pages with forms in my application. 

How can I secure the form in such a way that if someone navigates away or closes the browser tab, they should be prompted to to confirm they really want to leave the form with unsaved data?

Warn user before leaving web page with unsaved changes

I&#39;ve created a custom ValidationAttribute that compares 2 dates and makes sure that the second date is greater than the first:

    public sealed class IsDateAfter : ValidationAttribute, IClientValidatable
    {
        private readonly string testedPropertyName;
        private readonly bool allowEqualDates;

        public IsDateAfter(string testedPropertyName, bool allowEqualDates = false)
        {
            this.testedPropertyName = testedPropertyName;
            this.allowEqualDates = allowEqualDates;
        }

        protected override ValidationResult IsValid(object value, ValidationContext validationContext)
        {
            var propertyTestedInfo = validationContext.ObjectType.GetProperty(this.testedPropertyName);
            if (propertyTestedInfo == null)
            {
                return new ValidationResult(string.Format(&quot;unknown property {0}&quot;, this.testedPropertyName));
            }

            var propertyTestedValue = propertyTestedInfo.GetValue(validationContext.ObjectInstance, null);

            if (value == null || !(value is DateTime))
            {
                return ValidationResult.Success;
            }

            if (propertyTestedValue == null || !(propertyTestedValue is DateTime))
            {
                return ValidationResult.Success;
            }

            // Compare values
            if ((DateTime)value &gt;= (DateTime)propertyTestedValue)
            {
                if (this.allowEqualDates)
                {
                    return ValidationResult.Success;
                }
                if ((DateTime)value &gt; (DateTime)propertyTestedValue)
                {
                    return ValidationResult.Success;
                }
            }

            return new ValidationResult(FormatErrorMessage(validationContext.DisplayName));
        }

        public IEnumerable&lt;ModelClientValidationRule&gt; GetClientValidationRules(ModelMetadata metadata, ControllerContext context)
        {
            var rule = new ModelClientValidationRule
            {
                ErrorMessage = this.ErrorMessageString,
                ValidationType = &quot;isdateafter&quot;
            };
            rule.ValidationParameters[&quot;propertytested&quot;] = this.testedPropertyName;
            rule.ValidationParameters[&quot;allowequaldates&quot;] = this.allowEqualDates;
            yield return rule;
        }

CalendarEntry class:
...

    public virtual DateTime StartDate { get; set; }
        
    [IsDateAfter(&quot;StartDate&quot;, true, ErrorMessage=&quot;End date needs to be after start date&quot;)]
    public virtual DateTime EndDate { get; set; }


VIEW:

    $.validator.unobtrusive.adapters.add(
        &#39;isdateafter&#39;, [&#39;propertytested&#39;, &#39;allowequaldates&#39;], function (options) {
        options.rules[&#39;isdateafter&#39;] = options.params;
        options.messages[&#39;isdateafter&#39;] = options.message;
    });
    $.validator.addMethod(&quot;isdateafter&quot;, function(value, element, params) {
        alert(params.propertytested);
        var startdatevalue = $(&#39;input[name=&quot;&#39; + params.propertytested + &#39;&quot;]&#39;).val();
        if (!value || !startdatevalue) return true;
        return (params.allowequaldates) ? Date.parse(startdatevalue) &lt;= Date.parse(value) : Date.parse(startdatevalue) &lt; Date.parse(value);
    }, &#39;&#39;);

This works fine when the **CalendarEntry** is not wrapped inside another class. HOWEVER, when I use a view model like so:

        public class TrainingDateEditViewModel
        {
            #region Properties
    
            /// &lt;summary&gt;
            /// Gets or sets CalendarEntry.
            /// &lt;/summary&gt;
            public CalendarEntry CalendarEntry { get; set; }
    ....


The client validation no longer works because the html output produced is this:

    &lt;input type=&quot;text&quot; value=&quot;&quot; name=&quot;CalendarEntry.EndDate&quot; id=&quot;CalendarEntry_EndDate&quot; data-val-isdateafter-propertytested=&quot;StartDate&quot; data-val-isdateafter-allowequaldates=&quot;True&quot; data-val-isdateafter=&quot;End date needs to be after start date&quot; data-val=&quot;true&quot;&gt;

And the 

    data-val-isdateafter-propertytested=&quot;StartDate&quot; and IT SHOULD BE: &quot;CalendarEntry.StartDate&quot;.

How would I make it so that it would know to bind to &quot;CalendarEntry.StartDate&quot;
rule.ValidationParameters[&quot;propertytested&quot;] = this.testedPropertyName; // HERE IT SHOULD BE FULL NAME??? HOW??


thanks


MVC custom validation: compare two dates

I was wondering how I would best validate URLs in Rails. I was thinking of using a regular expression, but am not sure if this is the best practice.

And, if I were to use a regex, could someone suggest one to me? I am still new to Regex.

Rails: What&#39;s a good way to validate links (URLs)?

Validation using attributes in asp.net mvc is really nice. I have been using the `[Range(min, max)]` validator this far for checking values, like e.g.: 
  
    [Range(1, 10)]
    public int SomeNumber { get; set; }

However - now I need to check the min and max condition separately. I expected to find attributes like these: 

    [MinValue(1, &quot;Value must be at least 1&quot;)]
    [MaxValue(10, &quot;Value can&#39;t be more than 10&quot;)]
    public int SomeNumber { get; set; }

Are there any predefined attributes for writing this? Or how do I achieve this?  


Min/Max-value validators in asp.net mvc

We have this json schema [draft](https://datatracker.ietf.org/doc/html/draft-zyp-json-schema-03). I would like to get a sample of my JSON data and generate a skeleton for the JSON schema, that I can rework manually, adding things like description, required, etc, which can not be infered from the specific examples.

For example, from my input `example.json`:

    {
        &quot;foo&quot;: &quot;lorem&quot;, 
        &quot;bar&quot;: &quot;ipsum&quot;
    }
 
I would run my json_schema_generator tool and would get:

    { &quot;foo&quot;: {
        &quot;type&quot; : &quot;string&quot;,
        &quot;required&quot; : true,
        &quot;description&quot; : &quot;unknown&quot;
      },
      &quot;bar&quot;: {
        &quot;type&quot; : &quot;string&quot;,
        &quot;required&quot; : true,
        &quot;description&quot; : &quot;unknown&quot;
      }
    }

This example has been coded manually, so it has maybe errors.
Is there any tool out there which could help me with the conversion JSON -&gt; JSON schema?

Tool to generate JSON schema from JSON data

I wanna write my own form validation javascript library and I&#39;ve been looking on google how to detect if a submit button is clicked but all I found is code where you have to use onClick on `onSubmit=&quot;function()&quot;` in html.

I would like to make this javascript so that I don&#39;t have to touch any html code like adding onSubmit or onClick javascript.

Content Type	Original Author	Original Content on Stackoverflow
Question	CyberJunkie	View Question on Stackoverflow
Solution 1 - Regex	phlogratos	View Answer on Stackoverflow
Solution 2 - Regex	smoak	View Answer on Stackoverflow

Regex match one of two words

Regex Problem Overview

Regex Solutions

Solution 1 - Regex

Solution 2 - Regex

Filter LogCat to get only the messages from My Application in Android?

How to convert a unix timestamp (seconds since epoch) to Ruby DateTime?

Attributions