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     Defining a Build:message rule can be difficult. You have to work
     with the nesting of backslashes and the intricacies of regular
     expressions.
     See: ◄Tagged Expressions in Build:Message►
 
     Because backslashes have special meaning in both macro strings and
     regular expressions, it is easy to get the expression wrong.
     Predefined regular expressions can simplify your task.
 
     To match:                   Use the predefined expression:
 
     A filename                  \:p
     A line or column number     \:z
     A token                     \:i
 
     See: ◄Predefined Regular Expression►
 
     When you define a new message rule, PWB adds it to the end of the
     list of message rules. You cannot delete any rules during the
     session. A mistaken rule can cause errors for the rest of the
     session, thus interfering with the iterative process of debugging
     a new rule.
 
     It is easier to debug the Build:message regular expression by
     defining a regular-expression find-and-replace macro and testing
     it with a file of sample messages. Once the regular expression is
     correct, you can define the actual rule.
     See: ◄Debugging a Build:message Rule►
 
     See
 
     ◄Tagged Expressions in Build:Message►
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