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Scala find line location in line

I have this line:

var htmlString;

Assigned:

 <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" > <html> <head> <title>Payment Receipt</title> <link rel="stylesheet" type="text/css" href="content/PaymentForm.css"> <style type="text/css"> </style> <meta content='text/html; charset=UTF-8' http-equiv='Content-Type'/> </head> <body> <div id="divPageOuter" class="PageOuter"> <div id="divPage" class="Page"> <!--[1]--> <div id="divThankYou"> Thank you for your order! </div> <hr class="HrTop"> <div id="divReceiptMsg"> You may print this receipt page for your records. </div> <div class="SectionBar"> Order Information </div> <table id="tablePaymentDetails1Rcpt"> <tr> <td class="LabelColInfo1R"> Merchant: </td> <td class="DataColInfo1R"> <!--Merchant.val--> Ryan <!--end--> </td> </tr> <tr> <td class="LabelColInfo1R"> Description: </td> <td class="DataColInfo1R"> <!--x_description.val--> Rasmussenpayment <!--end--> </td> </tr> </table> <table id="tablePaymentDetails2Rcpt" cellspacing="0" cellpadding="0"> <tr> <td id="tdPaymentDetails2Rcpt1"> <table> <tr> <td class="LabelColInfo1R"> Date/Time: </td> <td class="DataColInfo1R"> <!--Date/Time.val--> 09-Jul-2012 12:26:46 PM PT <!--end--> </td> </tr> <tr> <td class="LabelColInfo1R"> Customer ID: </td> <td class="DataColInfo1R"> <!--x_cust_id.val--> <!--end--> </td> </tr> </table> </td> <td id="tdPaymentDetails2Rcpt2"> <table> <tr> <td class="LabelColInfo1R"> Invoice Number: </td> <td class="DataColInfo1R"> <!--x_invoice_num.val--> 176966244 <!--end--> </td> </tr> </table> </td> </tr> </table> <hr id="hrBillingShippingBefore"> <table id="tableBillingShipping"> <tr> <td id="tdBillingInformation"> <div class="Label"> Billing Information </div> <div id="divBillingInformation"> Test14 Rasmussen<br> 1234 test st<br> San Diego, CA 92107 <br> </div> </td> <td id="tdShippingInformation"> <div class="Label"> Shipping Information </div> <div id="divShippingInformation"> </div> </td> </tr> </table> <hr id="hrBillingShippingAfter"> <div id="divOrderDetailsBottomR"> <table id="tableOrderDetailsBottom"> <tr> <td class="LabelColTotal"> Total: </td> <td class="DescrColTotal"> &nbsp; </td> <td class="DataColTotal"> <!--x_amount.val--> US&nbsp;$250.00 <!--end--> </td> </tr> </table> <!-- tableOrderDetailsBottom --> </div> <div id="divOrderDetailsBottomSpacerR"> </div> <div class="SectionBar"> Visa ****0027 </div> <table class="PaymentSectionTable" cellspacing="0" cellpadding="0"> <tr> <td class="PaymentSection1"> <table> <tr> <td class="LabelColInfo2R"> Date/Time: </td> <td class="DataColInfo2R"> <!--Date/Time.1.val--> 09-Jul-2012 12:26:46 PM PT <!--end--> </td> </tr> <tr> <td class="LabelColInfo2R"> Transaction ID: </td> <td class="DataColInfo2R"> <!--Transaction ID.1.val--> 2173493354 <!--end--> </td> </tr> <tr> <td class="LabelColInfo2R"> Authorization Code: </td> <td class="DataColInfo2R"> <!--x_auth_code.1.val--> 07I3DH <!--end--> </td> </tr> <tr> <td class="LabelColInfo2R"> Payment Method: </td> <td class="DataColInfo2R"> <!--x_method.1.val--> Visa ****0027 <!--end--> </td> </tr> </table> </td> <td class="PaymentSection2"> <table> </table> </td> </tr> </table> <div class="PaymentSectionSpacer"> </div> </div> <!-- entire BODY --> </div> <div class="PageAfter"> </div> </body> </html>

And I want to find the location of "x_auth_code.1.val" in the line. And then I want to get a string from a location plus a certain number of characters. The goal would be to return the authorization code.

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2 answers

You should use indexOfSlice and then slice() in StringOps

 scala> val myString = "Hello World!" myString: java.lang.String = Hello World! scala> val index = myString.indexOfSlice("Wo") index: Int = 6 scala> val slice = myString.slice(index, index+5) slice: String = World

With your html line:

 scala> htmlString.indexOfSlice("x_auth_code.1.val") res4: Int = 2771
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Why aren't you using an XML parser? Do not treat XML as strings - you will be bitten if you do.

Here's a regex, but my advice is: DO NOT USE IT! Use xml tools.

 """\Qx_auth_code.1.val\E[^>]*>([^<]*)""".r.findFirstMatchIn(htmlString).map(_ group 1)
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