$string = 'SSM1234';
preg_match("SS{2,}\M+\[0-9]", $string);
Why does this regex not match my sample $string?
i need to check whether the given id is email address or ssmid.....also check there regular expression
if((!preg_match("/^S{2,}M+[0-9]+$/", $Forgot_field)) || (!preg_match("/^[_a-z0-9-]+(\.[_a-z0-9-]+)*@[a-z0-9-]+(\.[a-z0-9-]+)*(\.[a-z]{2,4})$/", $Forgot_field))){
$result = "Enter a valid SSM ID or Email ID";
}
This should works
$string = 'SSM1234';
$res = preg_match('/^S{2,}M+[0-9]+$/', $string);
You missed the delimiter / and your regexp match at least 3 S, not 2.
I've added also the start (^) and the end ($) of match. But it's no mandatory (it depends by your case)
This SS{2,} matches the following part of a string SSS or SSS[...] so at least 3 S.
What you need is:
/^S{2,}M[0-9]+$/
Of course with the missing delimiters, as mentioned abouth.
This regex matches strings like:
SSM1
SSSM1
SSSSSSM157453247
SSSM123
and so on.
If you need a regex which strictly matches your sample string try:
/^S{2}M\d{4}$/
This regex matches exactly {2} times a S, a M and then {4} times a digit (\d).
