replacing spaces controlling regex php

i'm graceful new unchanging expressions. i have requirement reinstate spaces square multi-line text. deputy manners these:

• replace spaces during start-of-line non-breaking space ( ).


• replace any instance steady spaces (more space together) same array non-breaking-spaces.


• single spaces during start-of-line sojourn untouched.

i used build relating pattern:

/( ){2,}|^( )/

let's assume i have quarrel text:

asdasd asdasd  asdas1
 asda234 4545    54
  34545 345  34534
34 345

using php unchanging countenance reinstate duty (like ), i wish output:

asdasd asdasd  asdas1
 asda234 4545    54
  34545 345  34534
34 345

i'm happy doing rudimentary calm substitutions controlling unchanging expressions, nonetheless i'm carrying problem operative out reinstate multiple-times inside review method cost i desire.