I have a 2 textbox

1 text box is empty .

text2 is multine true

second text box have some words.

text2 text Example :

"12345 is my number and 03451234567ddddsfsa

somethingis wrong034512345find 03451234567"

..............

i want to find 03451234567 11digit number in text box with first 3 or 4 numbers

i mean when we type 034 or 0345 in text1 and click command button then find 0345 in text box and select all numeric number means 03451234567 and add to a listbox.

Note: when find 0345 and check 11 digits or max . if find max to 11 digits so do not add

in listbox.

i hope every one can understand what we want to do .

simply i want to find 11 digit mobile numbers in text box with first 3 or 4 words.