Java REGEX to match an exact number of digits in a string

Question

I tried to find the answer to my problem in the questions history but they just come back in more than one thousand and after scanning through a few tens of matching answers

Answer 1

in Javascript console works this. Watch out for \\d:

replacedString = "rx14ax145N".replace(RegExp("x14(?!\\d)", "g"), "___");

r___ax145N