用正则表达式中的字符替换字符串

Question

I need to replace this string:

var img = "<img class='messages-emoji' src='js/message/emoji/thumbsup.gif'>" ;

with this:

(smile)

Here's what I tried:

var new = img.replace("<img class='messages-emoji' src='js/message/emoji/thumbsup.gif'>", "(smile)");

I need to replace this in Regex Javascript

Answer 1

I think the issue is that you are using the reserved word new as your variable name. I suggest changing to something different:

 var newImg = img.replace("<img class='messages-emoji' src='js/message/emoji/thumbsup.gif'>", "(smile)");

As others have pointed out, regex doesn't make sense for this use case, a simple string replace is better for multiple reasons.

Regex would generally be used when you want to replace a string with variable parts, but you know some (pattern) of the source string. An example in your case would be if the src attribute could be anything, but you knew the tag was always going to have the messages-emoji class (Though even in this case, there are better ways to achieve this).

That said, I'll keep my answer in place as it does seem to have solved your problem.

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There a number of things wrong here:

• The new keyword is a reserved word in JavaScript, you need to choose a different name for your variable here otherwise you will get a syntax error.
• Your string contains / characters, which is used to denote a literal regular expression in JavaScript. You need to escape each of these with the \\ character.

var img = "<img class='messages-emoji' src='js/message/emoji/thumbsup.gif'>";
var regex = /<img class='messages-emoji' src='js\/message\/emoji\/thumbsup.gif'>/;

var newImg = img.replace(regex, "(smile)");