Split string via remembered Regex in javascript

Question

I have a string

var str="java+script+regex";

now i want to split the regex by + symbol only when + comes after word java.

So when i try

str.split(/java(\+)/)

then it splits the string using java+.So how can i split it using the + which comes after word java getting the result ["java","script+regex"]

Answer 1

You can use split captures:

 "java+script+regex".split(/(java)\+/)

which gives you

["", "java", "script+regex"]

or match :

"java+script+regex".match(/(java)(?:\+)(.+)/).slice(1)
["java", "script+regex"]

or replace :

"java+script+regex+java+chrome".replace(/(java)\+/g, "$1@").split("@")
["java", "script+regex+java", "chrome"]

This post shows different ways to emulate lookbehinds in javascript.

Answer 2

Simply do this

var n=(" "+str).split(/(?=java[+])/)
               .join("java")
               .split(/java[+]/);