What am I doing wrong in RegularExpressionValidator on a Multiline Textbox with Validation Expression?

What am I doing wrong in RegularExpressionValidator on a Multiline Textbox
with Validation Expression?

References

Reference NO 1

http://stackoverflow.com/questions/13655760/what-am-i-doing-wrong-in-regularexpressionvalidator-on-a-multiline-textbox-with

Reference NO 2

http://stackoverflow.com/questions/2321445/regular-expression-multiline-validator

Reference NO 3

http://stackoverflow.com/questions/6948723/regularexpressionvalidator-syntax-for-multiline-textbox

Reference NO 4

http://forumarray.com/regular-expression-validator-does-not-validate-empty-textbox-498691

Reference NO 5

http://forums.asp.net/t/prev/1282483

Reference NO 6

http://asp.net.bigresource.com/Regular-Expression-for-multiline-textbox--XF1Hq7FI5.html

Reference NO 7

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Reference NO 8

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