Javascript 正则表达式检查字符串中是否存在 http 或 https
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Regex to check if http or https exists in the string
提问by magicianiam
So i have this code:
所以我有这个代码：
function validateText(str)
{
var tarea = str;
var tarea_regex = /^(http|https)/;
if(tarea_regex.test(String(tarea).toLowerCase()) == true)
{
$('#textVal').val('');
}
}
This works perfectly for this:
这非常适用于此：
https://hello.com
http://hello.com
https://hello.com
http://hello.com
but not for:
但不适用于：
this is a website http://hello.comasdasd asdasdas
这是一个网站http://hello.comasdasd asdasdas
tried doing some reading but i dont where to place * ? since they will check the expression anywhere on the string according here -> http://www.regular-expressions.info/reference.html
试着做一些阅读，但我不知道放在哪里 * ？因为他们会根据这里检查字符串上任何地方的表达式 -> http://www.regular-expressions.info/reference.html
thank you
谢谢你
回答by D. Strout
From the looks of it, you're just checking if http or https exists in the string. Regular expressions are a bit overkill for that purpose. Try this simple code using indexOf:
从它的外观来看，您只是在检查字符串中是否存在 http 或 https。为此，正则表达式有点矫枉过正。使用indexOf以下方法试试这个简单的代码：
function validateText(str)
{
var tarea = str;
if (tarea.indexOf("http://") == 0 || tarea.indexOf("https://") == 0) {
// do something here
}
}
回答by Hosein Yeganloo
Try this:
尝试这个：
function validateText(string) {
if(/(http(s?)):\/\//i.test(string)) {
// do something here
}
}
回答by aztaroth
The ^in the beginning matches the start of the string. Just remove it.
在^一开始的字符串的开头匹配。只需将其删除。
var tarea_regex = /^(http|https)/;
should be
应该
var tarea_regex = /(http|https)/;
回答by web_bod
((http(s?))\://))
Plenty of ideas here : http://regexlib.com/Search.aspx?k=URL&AspxAutoDetectCookieSupport=1
这里有很多想法：http://regexlib.com/Search.aspx?k=URL& AspxAutoDetectCookieSupport=1
回答by Dan Tao
Have you tried using a word break instead of the start-of-line character?
您是否尝试过使用分词代替行首字符？
var tarea_regex = /\b(http|https)/;
It seems to do what I thinkyou want. See here: http://jsfiddle.net/BejGd/
它似乎做我认为你想要的。见这里：http: //jsfiddle.net/BejGd/
