RegExp查找标签和变量

Question

Can you please correct my RegExp so it will work? I need to check if the string I want to replace is not surrounded by an a tag.

var re = new RegExp("<a\b[^>]*>"+variable+"<\/a>","gi");

Answer 1

You must capture all links before and replace them by themselves:

var variable = "os";
var yourstring= "sdfsdlkjfsd <a href=blux> os</a> sdfsdflkjsdf os";

var re = new RegExp("(<a\\b[^>]*>(?:[^<]+|<(?!/a>))*</a>)|("+variable+")","gi");

function replacer(match, p1, p2){
    var replacement = "glups";
    return (p1)? p1 : replacement;
};
var result = yourstring.replace(re, replacer);
console.log(result);

Pattern detail:

(?:[^<]+|<(?!/a>))* describes the content between "a" tags, and means all that is not a < or a < that is not the part of the closing "a" tag

(?:          # open a non capturing group
    [^<]+    # all characters except < one or more times
  |          # OR
    <(?!/a>) # < not followed by "/a>"
)*           # close the non capturing group and repeat zero or more times

Answer 2

您需要将\\\\b的反斜杠加倍，以使其通过\\b到达正则表达式：

var re = new RegExp("<a\\b[^>]*>"+variable+"<\/a>","gi");