[英]Regex replace all occurences with something that is “derived” from the part to be replaced
[英]Replace part of string with Regex and extract replaced value
我有 markdown 内容,其中包含多张图片,其中每张图片是:
![Image Description](/image-path.png)
我正在使用 Regex 选择 markdown 内容中的所有图像:
var matches = new Regex(@"!\[.*?\]\((.*?)\)").Matches(content);
有了这个,我为每场比赛得到两组:
Groups[0] = ![Image Description](/image-path.png); > (Everything)
Groups[1] = /image-path.png > (Image Path)
对于 `content 中的每个图像路径,需要将其替换为新的 Guid。
然后将每个 Guid 和图像路径添加到以下字典中。
Dictionary<String, String> imagePathsKeys = new Dictionary<String, String>();
我试图使用Regex.Replace
,但我找不到一种方法来仅用 Guid 替换".\[?*.\]\((?*?)\)"
中的图像路径,提取旧值并将两者作为键和值添加到字典中。
如果我对您的理解正确,这就是您实现该目标的方法。 Do.net 小提琴。
Dictionary<String, String> imagePathsKeys = new Dictionary<String, String>();
var content = "![First Image Description](/image-path.png) ![Second Image Description](/image-path.png)";
// This regex will only match whatever is between / and .
// You may have to play around with it so it finds image names more accurately in your actual project
var matches = new Regex(@"(?<=\/)(.*?)(?=\.)").Matches(content);
foreach (Match match in matches)
{
GroupCollection groups = match.Groups;
var guid = Guid.NewGuid().ToString(); // generating new guid
imagePathsKeys.Add(guid, groups[0].Value); // adding new guid as key and image path as value
content = content.Replace(groups[0].Value, guid); // replacing image path with new guid
}
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