Question

How do I combine ch..+ and ch..- in regexp effectively without having to scan separately?
And are we using matcher in the pattern?

My output code is like this:

ch01+
ch01-
ch02+
ch02-
...

Answer 1

How do I combine ch..+ and ch..- in regexp effectively without having to scan separately?

Use | (pipe) for alternation:

ch..(\+|-)

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And are we using matcher in the pattern?

Depends on how you’re using the regexp and the pattern. To get a concrete answer, you’ll have to show some actual code, or ask a much more specific question.

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N.B. If you want to restrict the two characters after ch to 0-9, you can use \d, which is a shorthand character class for [0-9]:

ch\d{2}(\+|-)