如果特定单词的子字符串，则正则表达式忽略匹配

Question

I'm trying to match a text string in javascript as long as it isn't a substring of a predefined word.

Eg let's say we have these words in the file and even if there's a match, I don't want the word blue to show up in the search;

value
lunar
blue
clue

So if the user searches for lu , all the words other than blue should show up. If the user were to search for ue , only value and clue should be matched.

I tried doing a negative look ahead like this;

((?!blue)lu)

Didn't work though and I'm not sure what else to do.

Answer 1

You need to place \\w* to match 0 or more word characters between negative lookahead and your search string.

With lu as search string:

/\b(?!blue)\w*lu\w*/

With ue as search string:

/\b(?!blue)\w*ue\w*/

RegEx Demo

Actual Javascript code can be this:

var kw = "lu"; or "ue"
var re = new RegExp("\\b(?!blue)\\w*" + kw + "\\w*");