find with regex not working as expected
Solution 1:
From man 1 find [emphasis mine]:
-regex pattern
File name matches regular expression pattern. This is a match on the whole path, not a search. For example, to match a file named./fubar3, you can use the regular expression.*bar.or.*b.*3, but notf.*r3.
So this will find something:
find . -regextype sed -regex ".*/1[2-5][0-9][0-9]"
Note [1][2-5][0-9][0-9] you used covers the range 1200-1599. [1] can be just 1 as in my example.