Patterns in awk and sed

Have noticed that a pattern used with awk such as

Code:charcl='^[[:space:]]*([#;!]+|@c|\/\/)[[:space:]]*'
begrec="${charcl}"'Mode: rec$'has to be modified for use with `sed` by escaping the `()`.

Code:charcl='^[[:space:]]*\([#;!]+\|@c\|\/\/\)[[:space:]]*'
begrec="${charcl}"'Mode: rec$'Is this correct? I would like to set the same pattern in `charcl` for use in both `awk` and `sed` commands.