+validateInput() {
+    # Desc: Validates Input
+    # Usage: validateInput [str input] [str input type]
+    # Version: 0.3.1
+    # Input: arg1: string to validate
+    #        arg2: string specifying input type (ex:"ssh_pubkey")
+    # Output: return code 0: if input string matched specified string type
+    # Depends: bash 5, yell()
+
+    local fn argInput argType
+
+    # Save function name
+    fn="${FUNCNAME[0]}";
+
+    # Process arguments
+    argInput="$1";
+    argType="$2";
+    if [[ $# -gt 2 ]]; then yell "ERROR:$0:$fn:Too many arguments."; exit 1; fi;
+
+    # Check for blank
+    if [[ -z "$argInput" ]]; then return 1; fi
+    
+    # Define input types
+    ## ssh_pubkey
+    ### Check for alnum/dash base64 (ex: "ssh-rsa AAAAB3NzaC1yc2EAAA")
+    if [[ "$argType" = "ssh_pubkey" ]]; then
+       if [[ "$argInput" =~ ^[[:alnum:]-]*[\ ]*[[:alnum:]+/=]*$ ]]; then
+           return 0; fi; fi;
+
+    ## age_pubkey
+    ### Check for age1[:bech32:]
+    if [[ "$argType" = "age_pubkey" ]]; then
+       if [[ "$argInput" =~ ^age1[qpzry9x8gf2tvdw0s3jn54khce6mua7l]*$ ]]; then
+           return 0; fi; fi
+
+    ## integer
+    if [[ "$argType" = "integer" ]]; then
+       if [[ "$argInput" =~ ^[[:digit:]]*$ ]]; then
+           return 0; fi; fi;
+
+    ## time element (year, month, week, day, hour, minute, second)
+    if [[ "$argType" = "time_element" ]]; then
+       if [[ "$argInput" = "year" ]] || \
+              [[ "$argInput" = "month" ]] || \
+              [[ "$argInput" = "week" ]] || \
+              [[ "$argInput" = "day" ]] || \
+              [[ "$argInput" = "hour" ]] || \
+              [[ "$argInput" = "minute" ]] || \
+              [[ "$argInput" = "second" ]]; then
+           return 0; fi; fi;
+    
+    # Return error if no condition matched.
+    return 1;
+} # Validates strings