Regular Expressions 101

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"
<.*[^\x01-\x7E]+.*>
"
uUmg
< matches the character < with index 6010 (3C16 or 748) literally (case sensitive)
.
matches any character, including unicode (except for line terminators)
* matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
Match a single character not present in the list below
[^\x01-\x7E]
+ matches the previous token between one and unlimited times, as few times as possible, expanding as needed (lazy)
\x01-\x7E matches a single character in the range between  (index 1) and ~ (index 126) (case sensitive)
.
matches any character, including unicode (except for line terminators)
* matches the previous token between zero and unlimited times, as few times as possible, expanding as needed (lazy)
> matches the character > with index 6210 (3E16 or 768) literally (case sensitive)
Global pattern flags
u modifier: unicode case. Apply case insensitive matching to unicode characters in accordance with the unicode standard
U modifier: Unicode. Enable the built in character classes to also match unicode characters
m modifier: multi line. Causes ^ and $ to match the begin/end of each line (not only begin/end of string)
g modifier: global. All matches (don't return after first match)
Your regular expression does not match the subject string.

Regular Expression
No Match

"
"
uUmg

Test String