In this ticket, "show startup" command doesnt work when a regex is pssed to it. "show startup <regex>" (eg: "show startup system" gives empty output. Without passing regex, "show startup" works fine. 
The issue is due to conflicting regcomp(), regfree() functions. Posix regcomp() function was previously used by "show startup" function before the introduction of ca_regex library. Due to the addition of ca_regex library which also had regcomp(), regfree() this issue ocurred. Renamed regcomp(), regcomp() functions in ca_regex and wherever it is used.
Also fixed "clear system mail" and "clear ha config" to update  from_mail correctly.

AN(config)#sh startup system
Last configuration change at Fri Jan 16 14:43:28 2026 by array
system command timeout 120
system timezone configuration
system timezone "Asia/India/Kolkata"
system mail configuration
system mail from "%halert@log.domain"

system mail hostname "%l.alert_pseudo_domain" 0

system mail external off
system mail relay configuration
system mail relay off