Edit:

I have the following:

T1_sometext, T1_sometext2, T1_sometext3, T2_anothertext, T2_anothertext2, T2_anothertext3

I want to to capture each T group (followed by the same number). For example, I want to extract 2 groups in this example:

Desired outcome:

Group 1: T1_sometext, T1_sometext2, T1_sometext3

Group 2: T2_anothertext, T2_anothertext2, T2_anothertext3

I want the regex to work for unlimited numbers not just T1 and T2 (But if the number after T is the same, it should be in the same match)

CodePudding user response：

We can try using the following regex pattern:

/(T\d )_\w (?:,\s*\1_\w )*/gm

Explanation:

• (T\d ) match AND capture T followed by a number
• _ match underscore
• \w match a word
• (?:,\s*\1_\w )* optional comma/whitespace, T followed by number, _, and word, zero or more times

Here is a demo.

CodePudding user response：

One Simple Case

If you know in advance the number of Ti, say N=3, then can build a regex at run time:

(T1_[\w] )|(T2_[\w] )|(T3_[\w] )

Code: regex101.