regex101: https://github.com/tronprotocol/tips/blob/master/tip-20.md

Regular Expression

match this (?:match that)

New

match this match that/// TRC20.sol -- API for the TRC20 token standard

// See <https://github.com/tronprotocol/tips/blob/master/tip-20.md>.

// This file likely does not meet the threshold of originality

// required for copyright to apply.  As a result, this is free and

// unencumbered software belonging to the public domain.

pragma solidity >=0.4.25;

contract TRC20Events {

    event Approval(address indexed src, address indexed guy, uint wad);

    event Transfer(address indexed src, address indexed dst, uint wad);

}

contract TRC20 is TRC20Events {

    function totalSupply() public view returns (uint);

    function balanceOf(address guy) public view returns (uint);

    function allowance(address src, address guy) public view returns (uint);

    function approve(address guy, uint wad) public returns (bool);

    function transfer(address dst, uint wad) public returns (bool);

    function transferFrom(

        address src, address dst, uint wad

    ) public returns (bool)

Substitution

match this match that/// TRC20.sol -- API for the TRC20 token standard

// See <https://github.com/tronprotocol/tips/blob/master/tip-20.md>.

// This file likely does not meet the threshold of originality

// required for copyright to apply.  As a result, this is free and

// unencumbered software belonging to the public domain.

pragma solidity >=0.4.25;

contract TRC20Events {

    event Approval(address indexed src, address indexed guy, uint wad);

    event Transfer(address indexed src, address indexed dst, uint wad);

}

contract TRC20 is TRC20Events {

    function totalSupply() public view returns (uint);

    function balanceOf(address guy) public view returns (uint);

    function allowance(address src, address guy) public view returns (uint);

    function approve(address guy, uint wad) public returns (bool);

    function transfer(address dst, uint wad) public returns (bool);

    function transferFrom(

        address src, address dst, uint wad

    ) public returns (bool)