Perl prxmatch difference between space and word boundary \b

[brulard]

hi,

Can someone explain if/what is the difference in perl,using function  prxmatch, between space and word boundary \b?

Example adding a space (after POBOX):

if prxmatch ("m/POBOX /oi",BILL_ADDR_LINE1)> 0 

Example adding word boundary \b :

if prxmatch ("m/POBOX\b/oi",BILL_ADDR_LINE1)> 0

Thank you 

[Ksharp · Accepted solution]

The first one only match "POBOX ".

But the second one will match "POBOX " or "POBOX," or "POBOX."  .................