I am trying to match the following string in Javascript Regex
PC123456
This is what I have:
/^PC\d*/
This works for every instance minus one with a space after the "PC" which does work but it should fail. Example:
PC 123456
That should fail. What do I need to add to make the second condition fail?
Change your regex to this:
/^PC\d+$/
This requires at least one digit and only matches if there is nothing else in the string except the PC and the digits.
This will match:
PC123456
PC1
PC99
It will not match:
PC 12345
PC
PCx1234
You need to add an end-of-source anchor:
/^PC\d*$/
The "$" at the end insists that the pattern match the entire string. Without it, "PC" with no immediately subsequent digits matches because "*" means "zero or more", not "one or more".
You could alternatively change the "*" to a "+", but I don't know whether "PC" by itself is valid in your application.
Require at least one digit after PC
/^PC\d+/
or require the String to last the entire line
/^PC\d*$/
