C# 的 Regex.Replace

在 Perl 中正規表示法的取代，可以簡單的利用 $1、$2 等方式來輕鬆指代記憶的群組；比如：

$text="Hypermethylation of E-cadherin is an independent predictor of improved survival in head and neck squamous cell carcinoma. Shematic illustration of E-cadherin in adherens junction. E-cadherin homodimer on the cytoplasmic membranes of adjacent cells is shown. Moreover, overexpression of E-cadherin, which was found underexpressed in MTX-resistant cells, also sensitized the cells toward the chemotherapeutic agent";
$text=~s/([^>])(\bE-cadherin\b)([^<])/$1$2<\/span>$3/g;
print $text;

# 輸出：
Hypermethylation of E-cadherin is an independent predictor of improved survival in head and neck squamous cell carcinoma. Shematic illustration of E-cadherin in adherens junction. E-cadherin homodimer on the cytoplasmic membranes of adjacent cells is shown. Moreover, overexpression of E-cadherin, which was found underexpressed in MTX-resistant cells, also sensitized the cells toward the chemotherapeutic agent

在 C# 中，也可以辦到： String line="Hypermethylation of <span class='GENE' name='999'>E-cadherin</span> is an independent predictor of improved survival in head and neck squamous cell carcinoma. Shematic illustration of E-cadherin in adherens junction. E-cadherin homodimer on the cytoplasmic membranes of adjacent cells is shown. Moreover, overexpression of E-cadherin, which was found underexpressed in MTX-resistant cells, also sensitized the cells toward the chemotherapeutic agent"; line=Regex.Replace(line, @"([^>])(\bE-cadherin\b)([^<])","$1<span class='GENE' name='999'>$2</span>$3"); // or // line=Regex.Replace(line, @"(?<Part1>[^>])(?<GENE>\bE-cadherin\b)(?<Part2>[^<])","${Part1}<span class='GENE' name='999'>${GENE}</span>${Part3}");