Nginx location regex configuration issue - Not capturing subdomains of location specified - nginx

Question

I am using below nginx file. I have hosted multiple frontend (angular) projects on single server. So, I want to access different project on different path.
When I hit url www.*********.com/st_admit/dashboard
I want to access project place in directory /usr/share/nginx/html2; but nginx is redirecting to root domain i.e. "/" and open the project placed in /usr/share/nginx/html;
Please check below configuration file and let me know how I can fix the nginx location regex.
client_max_body_size 10M;
upstream django {
ip_hash;
server django_gunicorn:8001;
}
server {
server_name *************.*** www.******.***;
listen 443 ssl;
add_header Strict-Transport-Security "max-age=31536000; includeSubDomains; preload";
ssl_certificate /etc/nginx/***********.crt;
ssl_certificate_key /etc/nginx/*************.key;
client_max_body_size 4G;
proxy_read_timeout 20000;
proxy_connect_timeout 20000;
proxy_send_timeout 20000;
keepalive_timeout 200;
access_log /var/log/nginx/access.log;
error_log /var/log/nginx/error.log;
server_tokens off;
ssl_protocols TLSv1.2 TLSv1.3;
root /usr/share/nginx/html;
location ^~ /st_admin/(.*) {
alias /usr/share/nginx/html2;
index index.html index.htm;
include /etc/nginx/mime.types;
gzip on;
gzip_min_length 1000;
gzip_proxied expired no-cache no-store private auth;
gzip_types text/plain text/css application/json application/javascript application/x-javascript text/xml application/xml application/xml+rss text/javascript;
try_files $uri $uri/ /index.html;
}
location /api/ {
proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;
proxy_set_header X-Forwarded-Proto https;
proxy_set_header Host $http_host;
proxy_redirect off;
if (!-f $request_filename) {
proxy_pass http://django;
break;
}
}
location / {
root /usr/share/nginx/html;
index index.html index.htm;
include /etc/nginx/mime.types;
gzip on;
gzip_min_length 1000;
gzip_proxied expired no-cache no-store private auth;
gzip_types text/plain text/css application/json application/javascript application/x-javascript text/xml application/xml application/xml+rss text/javascript;
try_files $uri $uri/ /index.html;
}
}
I tried below location configurations, but none of these are working.
location ^~ /st_admin
location ^~ /st_admin/*
location ^~ /st_admin/(.*)