Scala find location of string in a string

Question

I have this string:

var htmlString;

Assigned to:

<!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 string. And then I want to obtain a string from the location plus a certain number of characters. The goal would be to return the Authorization code.

Wow. That line could really do with being broken over multiple lines. — Alex Wilson
– Alex Wilson, Commented Jul 9, 2012 at 19:46

Christopher Chiche · Accepted Answer · 2018-10-01 05:19:15Z

17

You can 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 string:

scala> htmlString.indexOfSlice("x_auth_code.1.val")
res4: Int = 2771

edited Oct 1, 2018 at 5:19

answered Jul 9, 2012 at 19:58

Christopher Chiche

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1 Comment

Paul Over a year ago

The indexOfSlice is a good addition to one's tool suite due to its worst case BigO runtime complexity

Daniel C. Sobral · Accepted Answer · 2012-07-09 20:13:35Z

0

Why aren't you using an XML parser? Don't treat XML as strings -- you'll get bitten if you do.

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

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

answered Jul 9, 2012 at 20:13

Daniel C. Sobral

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5 Comments

Kim Stebel Over a year ago

He's not using an XML parser, because he isn't dealing with XML. It's HTML 4.0 transitional. Of course there are parsers for that, but it might still be malformed. So if you want to recommend a parser, maybe something like jsoup would be good. But if he really just needs to extract one String, that is overkill.

Daniel C. Sobral Over a year ago

@KimStebel There are plenty tools that handle such. For example, Tag Soup and JTidy.

Kim Stebel Over a year ago

Yes, and all of them are probably overkill.

Daniel C. Sobral Over a year ago

@KimStebel TagSoup is a lightweight SAX parser, so it's less overkill than the standard SAX parser.

Kim Stebel Over a year ago

By overkill I meant it's one more dependency and probably doesn't simplify his code.

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