Regular Expressions: Extracting Data from a Match

   
/*
JavaScript Bible, Fourth Edition
by Danny Goodman 

John Wiley & Sons CopyRight 2001
*/


<HTML>
<HEAD>
<TITLE>Got a Match?</TITLE>
<SCRIPT LANGUAGE="JavaScript1.2">
function extractIt(form) {
    var months = ["January","February","March","April","May","June","July",
"August","September","October","November","December"]

var days = ["Sunday","Monday","Tuesday","Wednesday","Thursday","Friday","Saturday"]
    var re = /\b(1[0-2]|0?[1-9])[\-\/](0?[1-9]|[12][0-9]|3[01])[\-\/]((19|20)\d{2})/
    var input = form.entry.value
    var matchArray = re.exec(input)
    if (matchArray) {
        var theMonth = months[matchArray[1] - 1] + " "
        var theDate = matchArray[2] + ", "
        var theYear = matchArray[3]
        var dateObj = new Date(matchArray[3],matchArray[1]-1,matchArray[2])
        var theDay = days[dateObj.getDay()] + " "
        form.output.value = theDay + theMonth + theDate + theYear
    } else {
        form.output.value = "An invalid date."
    }
}
</SCRIPT>
</HEAD>
<BODY>
<B>Use a regular expression to extract data from a string:</B>
<HR>
<FORM>
Enter a date in the format mm/dd/yyyy or mm-dd-yyyy:<BR>
<INPUT TYPE="text" NAME="entry" SIZE=12><P>
<INPUT TYPE="button" VALUE="Extract Date Components" onClick="extractIt(this.form)"><P>
The date you entered was:<BR>
<INPUT TYPE="text" NAME="output" SIZE=40><P>
<INPUT TYPE="reset">
</FORM>
</BODY>
</HTML>

1.	Searching and Replacing Substrings
2.	Regular Expression Tester
3.	The Regular Expression Tester
4.	Regular Expression Match Workshop
5.	Regular Expressions: Looking for a Match
6.	Regular Expressions: Replacing Strings via Regular Expressions
7.	check Date format
8.	Split comma number string
9.	Use regular expression to validate url
10.	String match pattern: (.*)
11.	Whether a string is a valid phone number
12.	String replace with regular expression
13.	Finding a substring within a string
14.	Whether a string contains only numerical data
15.	Validate an email
16.	Using regular expressions to validate an email
17.	Using regular expression (callback function)
18.	Split a string array and get token
19.	Trim a string with regular expression from both sides
20.	The Backslash in RegExp
21.	Regular Expression Switch
22.	Try your regular expression here

Regular Expressions: Extracting Data from a Match : Regular Expressions « Development « JavaScript DHTML

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