Regex pattern "\{\{Tag\}\}" can't replace xml string

Question

source xml string

                <w:tc>
                    <w:tcPr>
                        <w:tcW w:w="1870" w:type="dxa"/>
                    </w:tcPr>
                    <w:p w14:paraId="4A2404F3" w14:textId="6CC57F74" w:rsidR="00B721B4" w:rsidRDefault="00B721B4">
                        <w:r>
                            <w:t>{{</w:t>
                        </w:r>
                        <w:proofErr w:type="spellStart"/>
                        <w:r>
                            <w:t>CreateDate</w:t>
                        </w:r>
                        <w:proofErr w:type="spellEnd"/>
                        <w:r>
                            <w:t>}}</w:t>
                        </w:r>
                    </w:p>
                </w:tc>

expect

<w:r>
    <w:t>2022-09-20</w:t>
</w:r>

I tried to use below regex and C# code to replace but it did not work.online demo

void Main()
{
    var input = @"<w:r>
    <w:t>{{</w:t>
</w:r>
<w:proofErr w:type=""spellStart""/>
<w:r>
    <w:t>CreateDate</w:t>
</w:r>
<w:proofErr w:type=""spellEnd""/>
<w:r>
    <w:t>}}</w:t>
</w:r>";
    var pattern = @"\{\{*CreateDate*\}\}";
    var output = Regex.Replace(input,pattern,"2022-09-20");
    Console.WriteLine(output);
}

I think * between {} can replace it, could friends give me idea about my mistakes, really appreciate!

Update2:

I tried to use \{\{.+Company_Name.+\}\} but it get full string between first {{ and last }}, online demo

Why are you using regex for this when XSLT and XPath are the more applicable solutions? — Tanveer Badar
– Tanveer Badar, Commented Sep 12, 2022 at 6:05
@TanveerBadar I'm trying create a xml template tool, it use string pattern like vue {{tag}} — Wei Lin
– Wei Lin, Commented Sep 12, 2022 at 6:09
Before writing it in C#, check it manually online on sites like regex101.com — Slack Groverglow
– Slack Groverglow, Commented Sep 12, 2022 at 6:10
Required reading stackoverflow.com/a/1732454/14868997. Do not use Regex for XML parsing, use a proper XML parser. — Charlieface
– Charlieface, Commented Sep 12, 2022 at 11:11

Slack Groverglow · Accepted Answer · 2022-09-12 06:23:01Z

1

My guess is there are two issues.

You aren't matching "any character after {{". It should be .* instead of just *
I think you aren't matching multi-line. You'll need specify the match for newline as well: (.|\n)* instead of .*

Giving you the regex string:

\{\{(.|\n)*CreateDate(.|\n)*\}\}

You might be able to use a simpler regex \{\{.*CreateDate.*\}\} by setting RegexOptions.Multline

answered Sep 12, 2022 at 6:23

Slack Groverglow

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Quercus · Accepted Answer · 2022-09-12 06:28:50Z

1

Try this one: {{[^{}]*CreateDate[^{}]*}}

answered Sep 12, 2022 at 6:28

Quercus

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Regex pattern "\{\{Tag\}\}" can't replace xml string

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