HTML input field restricted with regular expression pattern
Question
I want to restrict the user input in an HTML input field.
It is a field which accepts the weight in decimal and the unit(kg, lbs, g, t etc).
Following are few sample input which are valid:
10.45 kg
125.5 kg
120.35 lbs
160 lbs
1200.16 g
24.6 t
I am using the JQuery plugin mentioned in the below URL: http://www.thimbleopensource.com/tutorials-snippets/jquery-plugin-filter-text-input
But it is not working with complex patterns. Can anyone please help me with the regular expression to achieve the result?
Find the complete code below:
<!DOCTYPE HTML>
<html>
<head>
<title>Test</title>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<script src="/js/jquery/jquery-2.1.4.js" type="text/javascript"></script>
<script src="/js/jquery/jquery.filter_input.js" type="text/javascript"></script>
<script type="text/javascript">
<!--//
$(document).ready(function(){
$('#input_2').filter_input({ regex: '\d+(?:.\d+)?\s(?:kg|lbs|t)' });
});
//-->
</script>
</head>
<body>
Weight: <input id="input_2" type="text" size="20" />
</body>
</html>
2 answers
solution1
3 2015-10-12 10:34:33
如果使用HTML5是一个选项，那么你可以在输入中包含一个模式属性，例如使用Pranav C Balan的正则表达式：
<input type="text" name="weight" value="" pattern="^\d+(?:\.\d+)?\s*(?:kg|lbs|t)$" />
solution2
0 2015-10-12 10:34:29
The below is not the correct answer in this instance. As @stribizhev commented, the plugin you are using does not allow complex regex validation. It checks each individual character you type in against the regex, rather than validating the field as a whole.
This sort of validation does not seem to possible with your plugin, unfortunately.
The following matches all your examples:
^\d+(\.\d+)?\s(g|lbs?|kg|t)$
This breaks down as follows:
^ # Matches start of string
\d+ # 1 or more digits
(\.\d+)? # Optionally followed by a decimal point and more digits
\s # Whitespace
(g|lbs?|kg|t) # Any of g, lb, lbs, kg, t
$ # Match end of string
Example here (regex101.com).
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