Regex: Testing for entire string -


i'm learning how use regular expression, , i'm having difficulties problem.

suppose input number, , input returns true whole number if number contains @ least 1 7, no 9s.

for example: 123456789 should return false, , input of 12345678 should return true 12345678.

what regular expression should used this?

i know terms 7+ , [^9] involved, i'm not entirely sure how make return true entire number specific conditions (7+[^9] returns true input 12345678 123456789, when want return true 12345678).

sorry if worded question badly.

you may try like: ^[0-8]*7[0-8]*$


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