Hi, dear all
I want to extact all numbers from the string. I want to use the Lookahead and Lookbehind Zero-Length Assertions to do it (https://bedigit.com/blog/regex-how-t...cular-pattern/).

Code:
clear
input str64 x
"math：96;chinese：85; english：92; physical：90;"
"math：91;chinese：82; english：88; physical：98;"
"math：86;chinese：85; english：81; physical：90;"
"math：93;chinese：85; english：88; physical：90;"
"math：70;chinese：85; english：83; physical：91;"
"math：80;chinese：85; english：81; physical：92;"
end

gen grade1 = ustrregexs(1) if ustrregexm(x, "(?<=\：)([0-9]{2})")
list
 +-----------------------------------------------------------+
     |                                                x   grade1 |
     |-----------------------------------------------------------|
  1. | math：96;chinese：85; english：92; physical：90;       96 |
  2. | math：91;chinese：82; english：88; physical：98;       91 |
  3. | math：86;chinese：85; english：81; physical：90;       86 |
  4. | math：93;chinese：85; english：88; physical：90;       93 |
  5. | math：70;chinese：85; english：83; physical：91;       70 |
     |-----------------------------------------------------------|
  6. | math：80;chinese：85; english：81; physical：92;       80 |
     +-----------------------------------------------------------+
However, why only the first number is extracted?

Thanks very much!

Bests,
wanhai