starhu
asked on
Delphi : how to know if a string variable contains only a..z, A..Z, 0-9,-, _
Hello,
I have a string variable S.
I need to know if this S consists only of characters of a..z, A..Z, 0-9,-, _ or it contains other characters as well.
For example:
'skdfkfkAkd32-k33' would return True
'5_-kksdfTEkd5-' would return True
'DS3Á323-3kd' would return False
'23Kskdf-k!xx' would return False
I can do it with Pos, but the code would be too long to check every character.
The best solution would be something like regexpin MySql.
Thank you
I have a string variable S.
I need to know if this S consists only of characters of a..z, A..Z, 0-9,-, _ or it contains other characters as well.
For example:
'skdfkfkAkd32-k33' would return True
'5_-kksdfTEkd5-' would return True
'DS3Á323-3kd' would return False
'23Kskdf-k!xx' would return False
I can do it with Pos, but the code would be too long to check every character.
The best solution would be something like regexpin MySql.
Thank you
SOLUTION
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Sinisa Vuk
This function have little mistake: instead of do use then word in if .... line :-)
lol, yes you're right, tx sinisav :)
Also, the right parens should be a preceded square bracket character:
if not (str[i] in ['a'..'z', 'A'..'Z', '0'..'9', '-', '_']) then
and actually better to pass the string as const
function CheckString(const str: string): boolean;
var i: integer;
begin
result := true;
for i := 1 to Length(str) do
if not (str[i] in ['a'..'z', 'A'..'Z', '0'..'9', '-', '_']) then
begin
result := false;
exit;
end;
end;ASKER CERTIFIED SOLUTION
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