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Validating a Latvian Postcode using JavaScript and Regular Expressions
In Latvia Postcodes consist of two letters followed by a hyphen and four digits: LV-3014 Here then is a regular expression that can be used to validate the above postcode format. To limit the first two letters to capitols simply remove the lowercase a-z: ^([a-zA-Z]){2}[-]([0-9]){4}$ For more extensive introduction to the above regular expression here is a JavaScript Latvian Postcode validation code: <html> <head> <title>Latvian Postcode Validation with JavaScript</title> <script language="JavaScript"> function postcode_validate(postcode) { var regPostcode = /^([a-zA-Z]){2}[-]([0-9]){4}$/; obj = document.getElementById("status"); if(regPostcode.test(postcode) == false) { obj.innerHTML = "Postcode is not yet valid."; } else { obj.innerHTML = "Your postcode is valid!"; } } </script> <style type="text/css"> <!-- body { background:#CCCCFF; } div { width: 100%; text-align: center; margin-top:150px; } span { color: #000099; font: 8pt verdana; font-weight:bold; text-decoration:none; } input { color: #000000; background: #F8F8F8; border: 1px solid #353535; width:250px; font: 8pt verdana; font-weight:normal; text-decoration:none; margin-top:5px; } --> </style> </head> <body> <div> <span id="status">Please enter a valid postcode.</span><br> <input type="text" name="postcode" onkeyup="postcode_validate(this.value);"> </div> </body> </html>
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