Php check a specific pattern

Question

I want to check a certain pattern in a string. My pattern contains 3 parts:

Start : First character should be a number or alphabet
End : Last character should be a number or alphabet
Middle : In between characters can be any combination of numbers, alphabets or a hyphen/minus(-) or @.

I am using following regex:

preg_match('/^[a-zA-Z0-9]+[@\-]*[a-zA-Z0-9]+$/i');

and tested on string :

a-121kabrastreet@90

which evaluates to false. Please rectify my logic. Thank you

/a-zA-Z/i - it must be ignore-case-twice day. I see three conditions in your "text requirements, and three repetitions in your pattern. Please put "the middle repeated pattern" [@\-]* in words. How is the string "aa" matched, how "aaa"? — greybeard
– greybeard, Commented Mar 4, 2019 at 11:33

The fourth bird · Accepted Answer · 2019-03-04 13:58:26Z

1

The alphabets and digits should also be added to the character class in the middle. Note that you don't have to escape the hyphen if it is places at the end of the character class.

^[a-zA-Z0-9][@a-zA-Z0-9-]*[a-zA-Z0-9]$
              ^^^^^^^^^

You use the case insensitive flag, your pattern could look like:

/^[a-z0-9][@a-z0-9-]*[a-z0-9]$/i

Regex101 demo | Php demo

edited Mar 4, 2019 at 13:58

answered Mar 4, 2019 at 11:29

The fourth bird

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2 Comments

Himanshu Agrawal Over a year ago

Thanks for quick reply. It works. How can i add backward slash(\) to it. I tried this : /^[a-z0-9]+[a-z0-9@\-\/\\]*[a-z0-9]+$/i and tested with : a-121k/ab/rast@ree-t@9\0, which gives false

The fourth bird Over a year ago

There is also a backslash in there, try regex101.com/r/srWvsQ/2

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