Replace string either lowercase or uppercase - scripting

Question

I am writing a playbook to replace a string in three files. That string can be written either in lowercase or uppercase. Here is my code :
---
- name: "Modif string"
hosts: myhosts
tasks:
- name: "Replace line"
replace:
path: ~/Documents/{{ item }}
regexp: 'test'
replace: 'new'
with_items:
- 'file'
- 'file1'
- 'file2'
How can I make it work so the string 'test' is amended either it is written in lowercase or uppercase? Also what if there is randomly letter uppercase or lowercase in that string?
Thank you all.

Answer 1

Try as below
- name: "Replace line"
replace:
path: ~/Documents/{{ item }}
regexp: '(?i)test'
replace: 'new'

Answer 2

I finally wrote that script. Works like a charm.
- name: "Other test"
hosts: raspi
vars:
text_to_replace:
- {regexp: '(?i)(test)', line: 'new'}
- {regexp: '10', line: '20'}
my_files:
- {file: 'file'}
- {file: 'file1'}
- {file: 'file2'}
tasks:
- name: "Replace"
replace:
path: ~/test/{{item.1.file}}
regexp: "{{item.0.regexp}}"
replace: "{{item.0.line}}"
with_nested:
- "{{text_to_replace}}"
- "{{my_files}}"