Question

Hey i want a regular expression where word not repeated head to head and password must be alpha numeric

Example

pp47klm on this give a error message

p47kplm this one is write

Please Help me to make this regular expression where word not repeated head to head or Adjacent

Answer 1

If you’re asking for an alphanumeric password that does not contain any doubled characters, then

^(?!.*(.)\1)\w+$

would fit these requirements. However, that is not really a good password validating regex (as it will also allow 1 as a password), so you might want to think about your requirements a bit more thoroughly.