does textarea distinguish \r\n or \n?

Question

i have a texaarea which put regular expression to match html,so it's senstive to \r\n & \n, and i don't know textarea how's doing with this,

when i write a wring regular expression with muliple lines,put these string to the textarea,then send to the server process match procedure,it will not work,i think the main reason is \r\n \n symbol issue,so any one has some advise?thank you

<td width="180px">
       test multiple line match ....
              </td>