On 10/31/22 1:31 AM, Hyunho Cho wrote:
# this is an error
# [[ ]] command recognizes ">(.*)" as process substitution.
bash$ [[ $val =~ ((.*)<[^>]*>(.*)) ]] && echo yes # Error !
bash$ .*: command not found
Yes, process substitution is one of the word expansions the pattern
undergoes (all words between [[ and ]] undergo the same set of word
expansions).
################ The Second problem #################
This only happens in the terminal.
# 1. intentionally makes an error by removing escape "\>" to ">"
bash$ [[ $val =~ (.*)\ \<[^\>]*>\ (.*) ]] && echo yes
bash: syntax error in conditional expression: unexpected token `>'
# 2. fixed the error with \> escape, but the error continues
bash$ [[ $val =~ (.*)\ \<[^\>]*\>\ (.*) ]] && echo yes
bash: syntax error near unexpected token `$val'
This has already been fixed, the result of
https://savannah.gnu.org/support/index.php?110745
# 3. On the second try, the error goes away.
bash$ [[ $val =~ (.*)\ \<[^\>]*\>\ (.*) ]] && echo yes
yes
################ The third problem #################
This also happens only in the terminal.
but very unexpectedly happens
I can't reproduce this using bash-5.2.2.
--
``The lyf so short, the craft so long to lerne.'' - Chaucer
``Ars longa, vita brevis'' - Hippocrates
Chet Ramey, UTech, CWRU c...@case.edu http://tiswww.cwru.edu/~chet/
