strip() {
    # Usage: strip "string" "pattern"
    printf '%s
' "${1/$2}"
}

$ strip "The Quick Brown Fox" "[aeiou]"
Th Quick Brown Fox

$ strip "The Quick Brown Fox" "[[:space:]]"
TheQuick Brown Fox

lstrip() {
    # Usage: lstrip "string" "pattern"
    printf '%s
' "${1##$2}"
}

$ lstrip "The Quick Brown Fox" "The "
Quick Brown Fox

rstrip() {
    # Usage: rstrip "string" "pattern"
    printf '%s
' "${1%%$2}"
}

$ rstrip "The Quick Brown Fox" " Fox"
The Quick Brown