Javascript字符串替换 - 非字母数字字符的RegEx，如反斜杠，大于等等

Question

I have a string that was serialized from the DOM world and I want to find some closing tags in that string and replace them with a new string. I never know the length of that original string, so character counts etc. will not work here. A sample scenario:

var onetext = "</content><tag>A whole bunch of stuff</tag></message>"
var twotext = "</content><tag>A whole bunch of new, unrelated stuff</tag></message>"
var threetext = onetext.replace(/[\/<]/\\/content>.+</message>/,"</content>"+twotext+"</message>");

I clearly don't have the regular expressions right to find these instances of backslash, greater-than or less-than. I welcome anyone's help in getting this to run correctly. Thanks.

Answer 1

If you want to capture everything that is NOT an allowed character, then write your expression for that.

Here is an expression for that (keeps number, letter and spaces, rejects everything else): (?![a-zA-Z0-9 ]).

If you are looking for something specific to HTML tags, you want (catches open and close tags):

([\\<]|[/>])

Answer 2

Apparently, there is a way to do this with one line

You can use grouping identifiers in your replacements string like this:

'<foo>Some data</foo>'.replace(/(<foo>)(.+)(<\/foo>)/,'<bar>$2</bar>')

However, at the end of the day, if you ONLY want to replace closing tags, just replace those, don't worry about the rest of the content, unless you need to pass that through as well. If you are only looking at ... then this is the expression you need:

/<\/content>.+<\/message>/