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Annotation of 43BSD/ingres/doc/quel/delim.nr, revision 1.1.1.1

1.1       root        1: .th DELIM QUEL 12/21/84
                      2: .sh NAME
                      3: delim - specify a name for a pattern of characters
                      4: .sh SYNOPSIS
                      5: .bd destroy
                      6: .bd delim
                      7: groupname
                      8: (
                      9: delimitor, pattern
                     10: )
                     11: .br
                     12: pattern =
                     13: [ "[character list]" | "{character list}" ]*
                     14: .br
                     15: .sh DESCRIPTION
                     16: The delim statement allows the user to specify a name for
                     17: a certain pattern of characters, which may be used with the substring
                     18: facility. The delimitors are stored in groups, which may be used
                     19: and unused together.
                     20: .s3
                     21: The pattern for a delimitor is specified using a modified
                     22: version of BNF grammar. A character list is either a list of the
                     23: characters to match, or a range of characters separated by a "-",
                     24: or a combination or both of the above. A character list in brackets 
                     25: indicates that one of the characters must match exactly once,
                     26: and a character list in braces indicates that one of the characters
                     27: may match zero or more times. The pattern is composed of a list
                     28: of character lists.
                     29: .s3
                     30: After a delimitor has been defined, to be used in
                     31: an ingres query it must be activated using the 'use' command.
                     32: .sh EXAMPLE
                     33: .nf
                     34: /\*(** will match a sequence of alphabetic characters beginning
                     35: with a capital letter \*(**/
                     36: define delim paper(word, "[A-Z]{a-z}")
                     37: .s1
                     38: /\*(** will match a decimal number \*(**/
                     39: define delim math (dec, "[0-9]{0-9}[.][0-9]{0-9}")
                     40: .s1
                     41: .fi
                     42: .sh "SEE ALSO"
                     43: destroy(quel), quel(quel), use(quel) 

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