using wild card for matching string variables

Hi, I have created a string (pattern) variable containing 0 and 1. For example, a string pattern 0000000011 means the person appears in 10 years of survey where she has 0 response in first eight years and 1 response in last two years.

From this string pattern, now I want to detect who has at least two consecutive 1 response in any years, that means I want to locate *11* pattern in any parts of the string whatever be the value of *.

Please help if anybody is familiar with the STATA code.