Regex

wikipedia:regex (1951)

• or [[|]]

Ansible

  - lineinfile:
       path: /etc/default/sysstat
       state: present
       backrefs: yes
       regexp: '^ENABLED="false"'
       line: 'ENABLED="true"'

insertafter:

JavaScript

npm install escape-string-regexp
ansi-regex

Python

 import re

regex.match

java.util.regex

• Ruby: https://rubular.com/

See also

• Regex, Re, ansi-regex
• Programming: C, Python, go, loop, while, for, if, variable, Error handling, Regex, Function, IDE, await, R (programming language), XACML, Type, Class inheritance, Methods, Scheme, Array, Deserialization