如何在javascript中使用正则表达式格式化字符串

这是我从数据库中获取的字符串

var str=" The requirements of this chapter apply to the following:(1) New 
buildings or portions thereof used as health care occupancies (see 1.4.1)(2) 
Additions made to, or usedas, a health care occupancy (see 4.6.6 and 18.1.1.4)(2)
and test.Exception: Exception no 1  The requirement of 18.1.1.1.1 shall not apply
to additions classified as occupancies other than health care that are separated
from the health care occupancy in accordance with 18.1.2.1(2) and conform to the
requirements for the specific occupancy in accordance with Chapters 12 through 17
and Chapters 20 through 42, as appropriate.(3) Alterations, modernizations, or  
renovations of existing health care occupancies (see 4.6.7 and 18.1.1.4)(1)(4)
Existing buildings or portions thereof upon change of occupancy to a health care 
occupancy (see 4.6.11)Exception *: Facilities where the authority having 
jurisdiction has determined equivalent safety has been provided in accordance 
with Section 1.5."

我使用了以下条件

str = str.replace(/('s'('d+')|exception's*':*)/gi, "<br /><br />$1&nbsp"); 

得到:

The requirements of this chapter apply to the following:
(1) New buildings or portions thereof used as health care occupancies (see 1.4.1)
(2) Additions made to, or usedas, a health care occupancy (see 4.6.6 and 18.1.1.4)
(2) and test.
Exception: 
Exception no 1  The requirement of 18.1.1.1.1 shall not apply to additions classified as occupancies other than health care that are separated from the health care occupancy in accordance with 18.1.2.1(2) and conform to the requirements for the specific occupancy in accordance with Chapters 12 through 17 and Chapters 20 through 42, as appropriate.
(3) Alterations, modernizations, or renovations of existing health care occupancies (see 4.6.7 and 18.1.1.4)
(1)
(4) Existing buildings or portions thereof upon change of occupancy to a health care occupancy (see 4.6.11)
Exception *: Facilities where the authority having jurisdiction has determined equivalent safety has been provided in accordance with Section 1.5.

但是我想要的输出是

The requirements of this chapter apply to the following:
(1) New buildings or portions thereof used as health care occupancies (see 1.4.1)
(2) Additions made to, or usedas, a health care occupancy (see 4.6.6 and 18.1.1.4)(2) and test.
Exception: Exception no 1  The requirement of 18.1.1.1.1 shall not apply to additions classified as occupancies other than health care that are separated from the health care occupancy in accordance with 18.1.2.1(2) and conform to the requirements for the specific occupancy in accordance with Chapters 12 through 17 and Chapters 20 through 42, as appropriate.
(3) Alterations, modernizations, or renovations of existing health care occupancies (see 4.6.7 and 18.1.1.4)(1)
(4) Existing buildings or portions thereof upon change of occupancy to a health care occupancy (see 4.6.11)
Exception *: Facilities where the authority having jurisdiction has determined equivalent safety has been provided in accordance with Section 1.5.

thanks in advance.