c# - match pattern for startswith -

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i want regex match in c# check whether string starts part of pattern. if pattern "abc...ghi" valid strings can in format "a","ab","abcdef","abcxyxghi"

this sample code. regex has in pattern make work

string pattern = "abc...ghi"  code = "a"  //valid code = "abc" valid code = "abcde" //valid code = "abcxxx" //valid code = "abcxxxghi" //valid code = "abcxxxghiaa" //invalid code = "b" //invalid  regex.ismatch(code, pattern)

you can use ? , make optional part of regexp. final regexp string be

a(b(c(.(.(.(g(h(i?)?)?)?)?)?)?)?)?

the final string quite messy can create automatically

the visualization of above regexp here http://www.regexper.com/#a(b(c(.(.(.(g(h(i%3f)%3f)%3f)%3f)%3f)%3f)%3f)%3f)%3f


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