I have a string with three different texts inside the exact line, separated by a _

I want a regex to extract the first part of the data, a regex for the second, and one for the last part.

The string is like xxxxxx_yyyyyyy_zzzzzz (where x, y, and z it's random data).

I have tried this:

^[^_]*

But I can only figure out how to match the first part of the data for x.

CodePudding user response：

You haven't given us what programming language you are using regex from. But, generally, this is what you want:

^([^_] )_([^_] )_([^_] )$

The parenthesis are "capturing groups" which can then be referred to as \x, $x, some other way where x is 1, 2 or 3. That depends on your regex implementation and programming language. Using your example string, \2 would be yyyyyyy.

CodePudding user response：

As alternative, you can use positive look-ahead (?=) and positive look-behind (?<=) capture groups like this:

(?<=_|^)\d (?=$|_)

This is relatively safe RegExp, as long as original string only contain numbers.

Explanation and examples: https://regex101.com/r/ZptWHV/1