验证URL [英] Validate an URL

问题描述

当前，我正在使用Angular5.我尝试按以下方式验证URL:

Currently, I am using Angular 5. I tried to validate an URL as follows:

HTML:

<div class="form-group col-sm-6">
  <input formControlName="s_url" type="url" class="form-control" id="kk" placeholder="url">
  <error-display [displayError]="isValid('s_url')" errMsg="This field is required!"></error-display>
</div>

在validate.ts文件中，我具有以下模式:

In validate.ts file, I have this pattern:

s_url: new FormControl('', [
  Validators.required,
  Validators.pattern("/^(http[s]?:\/\/){0,1}(www\.){0,1}[a-zA-Z0-9\.\-]+\.[a-zA-Z]{2,5}[\.]{0,1}/")
]),

但是使用此模式，即使键入正确的URL，也会显示错误消息.

But with the pattern, error message is shown even when a correct url is typed.

推荐答案

您可以通过稍微修改和分隔正则表达式来尝试这种方式:

You can try this way, by slightly modifying and separating your regex:

const reg = '(https?://)?([\\da-z.-]+)\\.([a-z.]{2,6})[/\\w .-]*/?';
...
Validators.pattern(reg)

根据我的经验，引号(")和斜杠(/)直接传递到.pattern()

From my own experience the quotes (") and slashes (/) can sometimes cause issues with the regex when passed directly into .pattern()

这是一个正常工作的 演示

Here is a working Demo

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