E-MAIL Validation

I've seen many people making queries about the EMAIL validation. It depends on the requirement. Hence, SAP didn't create any specific standard function module for validation the E-mail. There is one FM which people refer to in Forums but it's different unlike the below code.

This code helps in validating an email that requires following validation.

1. Format should be X@Y.Z where X, Y, Z can be alphabets, characters, Special characters.
2. X, Y, Z should not be Null.
3. Contains '@' and '.' in that sequence.
4. There should be a minimum of one dot and maximum of two dots after '@'.
5. E-mail address should not contain any white space.

Here is the code,

Let's say i created a subruotine called validate_mail with a single parameter called gv_mail. Comments itself will explain the code.

*&---------------------------------------------------------------------*
*& Form validate_mail
*&---------------------------------------------------------------------*
* Validates Email entered
*----------------------------------------------------------------------*
* -->P_GV_EMAIL text
*----------------------------------------------------------------------*
FORM validate_mail USING P_GV_EMAIL.
data: lv_search type sy-fdpos,
lv_length type i,
lv_len_name type i,
lv_len_domain type i,
lv_name(100) type c,
lv_domain(100) type c.
* clear indicator for mail validation which is used to raise error msg
clear: wf_mail,
lv_Search,
lv_length,
lv_len_name,
lv_len_domain,
lv_name,
lv_domain.
* Calculate the length of the email field.
lv_length = strlen( p_gv_email ) - 1.
* If the first or last letter is '@' or '.', terminate the subroutine.
if p_gv_email(1) = co_attherateof or p_gv_email(1) = co_dot.
wf_mail = 1.
exit.
elseif p_gv_email+lv_length(1) = co_attherateof
or p_gv_email+lv_length(1) = co_dot.
wf_mail = 1.
exit.
endif.
* Check if '@', and '.' exists or not.
if p_gv_email np '@' or p_gv_email np '.'.
wf_mail = 1.
exit.
endif.
* Check for white space in email field.
if p_gv_email(lv_length) ca ' '.
wf_mail = 1.
exit.
endif.
* Look for '@' and separate name, domain for validations.
search p_gv_email for co_attherateof.
if sy-subrc = 0.
lv_Search = sy-fdpos.
lv_name = p_gv_email+0(lv_Search).
lv_Search = lv_Search + 1.
lv_domain = p_gv_email+lv_Search.
endif.
* Check if name or domain is empty.
if lv_name is initial or lv_domain is initial.
wf_mail = 1.
exit.
endif.
* Calculate the length of each field.
lv_len_name = strlen( lv_name ).
lv_len_domain = strlen( lv_domain ).
* Validate lv_name and lv_domain for second '@'.
if lv_name cp '@' or lv_domain cp '@'.
wf_mail = 1.
exit.
endif.
* Validate for min. one dot and max. two dots in domain field.
if lv_domain cp '.'.
clear lv_search.
lv_Search = sy-fdpos.
if lv_search = 0.
wf_mail = 1.
exit.
else.
lv_Search = lv_Search + 1.
if lv_domain+lv_search cp '.'.
if sy-fdpos = 0.
wf_mail = 1.
exit.
else.
lv_Search = lv_search + sy-fdpos + 1.
if lv_domain+lv_Search cp '.'.
wf_mail = 1.
exit.
endif.
endif.
endif.
endif.
else.
wf_mail = 1.
exit.
endif.
ENDFORM. " validate_mail


After calling this subrotuine, we will check if wf_mail is 0 or 1. If wf_mail = 1, we raise an error message.