Create regex from glob expression

Question

i write program that parse text with regular expression. Regular expression should be obtained from user. I deside to use glob syntax for user input, and convert glob string to the regular expression internally. For example:

"foo.? bar*"  

should be converted to

"^.*foo\.\w\bar\w+.*" 

Somehow, i need to escape all meaningful characters from the string, then i need to replace glob * and ? characters with apropriate regexp syntax. What is the most convinient way to do this?