How can i use if else validation in regex

Question

I know how to validate a constant string with regex, but I'm really having trouble finding out how to do the following: I want a regex to validate the string edv_ after that I want the validation to be dependent:

if the user inputs for example edv_2, only 6 or 7 can be the next character. So only edv_26 or edv_27 would be valid
if the user would enter edv_3 then only edv_32 or edv_39 would be valid

Ive tried searching on the internet watched several youtube tutorials. None of them seem to handle this kind of thing. It's always only 1 constant thing they want to validate.

/[e][d][v][_][A]/ig

This matches the first part (edv_digit) but I have no clue how I should continue with the if else conditions.

Pushpesh Kumar Rajwanshi · Accepted Answer · 2018-12-28 18:10:19Z

2

You basically need alternations for handling your various cases. You can use this regex which matches as per your criteria.

\bedv_(?:2[67]|3[29])\b

Here boundaries ensure it doesn't match partial text like abcedv_26 or edv_26111 and it starts matching with edv_ then looks for either 2 followed by either 6 or 7 or looks for 3 followed by 2 or 9.

Live Demo

edited Dec 28, 2018 at 18:10

answered Dec 28, 2018 at 18:03

Pushpesh Kumar Rajwanshi

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