Regex for fixed length string, starting with multiple words -


i'm trying make regex (js flavor) matches string 17 alphanumeric characters in length , must start either "ab, "de" or "gh". after these 3 possibilities, alphanumeric character accepted.

match:

ab163829f13246915 det639601ba167860 ghf1973771a002957

don't match

xyz63829f13246915 aaa639601ba167860 bbc1973771a002957

so far have regex i'm testing on http://regexpal.com/

^(ab|)[a-za-z0-9]{17}$

not sure why pipe character required match first example, or why fails when add "de" after pipe.

anyone?

use this:

^(ab|de|gh)[a-za-z0-9]{15}$

the first 2 characters take two, need 15 more alphanumeric characters after that.

http://rubular.com/r/rawmiy4xeh


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