Finding the right Regular Expressions in JavaScript

Question

Having hard time finding the correct regex in JavaScript.

this is the test string

[tr1,1,70,18][jl2]39th St [nl1]Adams Blvd [tr71,1,39,18][jl3]$0.70[nl1]$0.80[tr1,19,110,8][jl3]HOV2+ W/FLEX $0

and I'd like to find an expression that matches all of the 3 string below:

[tr1,1,70,18][jl2]39th St [nl1]Adams Blvd 

[tr71,1,39,18][jl3]$0.70[nl1]$0.80

[tr1,19,110,8][jl3]HOV2+ W/FLEX $0

I managed to get close with this regex which matches the [tr portions but need the rest of the text as well.

\[tr\d+,\d+,\d+,\d+\]

regex tester here.

Answer 1

If there's nothing starts with [tr other than the beginning of the group, you may try this regex:

\[tr(?:(?!\[tr).)*

• \[tr starting with [tr
• (?:(?!\[tr).)* matching every character after it unless there's an another [tr ahead

const text = '[tr1,1,70,18][jl2]39th St [nl1]Adams Blvd [tr71,1,39,18][jl3]$0.70[nl1]$0.80[tr1,19,110,8][jl3]HOV2+ W/FLEX $0';

const regex = /\[tr(?:(?!\[tr).)*/g;

const result = text.match(regex);

console.log(result);

Or you can try this one for safer choice:

\[tr\d+,\d+,\d+,\d+\](?:(?!\[tr\d+,\d+,\d+,\d+\]).)*