Extraiga la subcadena usando expresiones regulares en bash simple

Solución:

Usando puro bash:

$ cat file.txt
US/Central - 10:26 PM (CST)
$ while read a b time x; do [[ $b == - ]] && echo $time; done < file.txt

otra solución con bash regex:

$ [[ "US/Central - 10:26 PM (CST)" =~ -[[:space:]]*([0-9]{2}:[0-9]{2}) ]] &&
    echo ${BASH_REMATCH[1]}

otra solución usando grep y expresión regular avanzada de búsqueda:

$ echo "US/Central - 10:26 PM (CST)" | grep -oP "-s+Kd{2}:d{2}"

otra solución usando sed:

$ echo "US/Central - 10:26 PM (CST)" |
    sed 's/.*- *([0-9]{2}:[0-9]{2}).*/1/'

otra solución usando perl:

$ echo "US/Central - 10:26 PM (CST)" |
    perl -lne 'print $& if /-s+Kd{2}:d{2}/'

y el último usando awk:

$ echo "US/Central - 10:26 PM (CST)" |
    awk '{for (i=0; i<=NF; i++){if ($i == "-"){print $(i+1);exit}}}'

    echo "US/Central - 10:26 PM (CST)" | sed -n "s/^.*-s*(S*).*$/1/p"

-n      suppress printing
s       substitute
^.*     anything at the beginning
-       up until the dash
s*     any space characters (any whitespace character)
(      start capture group
S*     any non-space characters
)      end capture group
.*$     anything at the end
1      substitute 1st capture group for everything on line
p       print it

Técnica chop-chop rápida y sucia, sin expresiones regulares y de baja robustez

string="US/Central - 10:26 PM (CST)"
etime="${string% [AP]M*}"
etime="${etime#* - }"

---

---

Utiliza Nuestro Buscador