Regular expression for srting pattern in bootstrap validation

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PHP

regular-expression

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Hi all

I'm having a problem in creating a regular expression to validate a field in my PHP system. I have searched for many solutions, but I haven't found a proper one. Can anyone help me to create a regular expression matches the following format. I have tried the below coding, but when validating, it requires to delete a character or whitespace. I would be much obliged if anyone could kindly help me to sort out this issue. Thank you.

Format:

(Numbers) | (English letters).

Ex : 12 | Harindu

What I have tried:

invoice_customer : { validators: {

        notEmpty : { message : 'Customer is required.'},

         regexp: {
             regexp: '\\s\\|\\s',
             message: 'Invalid Format'
         }


    }


},