使用正则表达式提取对话

Question

I have text like this:

[agent]:Welcome to ABC bank My name is Asif. How may I help you [cust]:I got additional charge in my credit card, I will not be paying this, please remove it [agent]:Okay can I place the call on hold [cust]:This is very unresponsive behaviour on banks side

The conversations are not line seperated. I need to extract only what customer said and ignore what agent said for analyzing customer sentiment. Please help with this regex.

Answer 1

Either:

\\[cust\\]:((?:(?!\\[\\w+\\]:).)*)

or

(?s)\\[cust\\]:(.*?)(?=\\[\\w+\\]:|$)

https://regex101.com/r/RT2O4y/1

Benchmarks:

Regex1:   \[cust\]:((?:(?!\[\w+\]:).)*)
Options:  < none >
Completed iterations:   50  /  50     ( x 1000 )
Matches found per iteration:   2
Elapsed Time:    1.37 s,   1372.69 ms,   1372693 µs
Matches per sec:   72,849


Regex2:   (?s)\[cust\]:(.*?)(?=\[\w+\]:|$)
Options:  < none >
Completed iterations:   50  /  50     ( x 1000 )
Matches found per iteration:   2
Elapsed Time:    0.92 s,   918.17 ms,   918175 µs
Matches per sec:   108,911