I think this is a great idea. If you manage to improve the regular expression pattern (or even fix a problem with it), you are going to change it in one place and not everywhere (maybe this is the motive for doing this).
This will reduce the number of potential errors in the program (or increase them if you change them incorrectly. However, this "should" appear almost immediately during testing, and you only have to fix it in one place, unlike everywhere ... again, more error prone).
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