$
$
$ # equal-to (=) operator not followed by space
$ cat file1.sql
SEL elapsedtime ,StartTime,QueryText
FROM     dbc.qry
WHERE    StartTime >= '2010-03-24 20:10:08'
        AND      username ='xxx_yyy_aaa_01'
ORDER    BY LastRespTime DESC
$
$ perl -lne '/^(\s*\w+){2}\s*(.*?)[\s(]*.xxx_yyy_aaa_01.*$/ && print $2' file1.sql
=
$
$ # equal-to (=) operator followed by a space
$ cat file2.sql
SEL elapsedtime ,StartTime,QueryText
FROM     dbc.qry
WHERE    StartTime >= '2010-03-24 20:10:08'
        AND      username = 'xxx_yyy_aaa_01'
ORDER    BY LastRespTime DESC
$
$ perl -lne '/^(\s*\w+){2}\s*(.*?)[\s(]*.xxx_yyy_aaa_01.*$/ && print $2' file2.sql
=
$
$ # IN operator followed by bracket "(" not followed by space
$ cat file3.sql
SEL elapsedtime ,StartTime,QueryText
FROM     dbc.qry
WHERE    StartTime >= '2010-03-24 20:10:08'
        AND      username in('xxx_yyy_aaa_01')
ORDER    BY LastRespTime DESC
$
$ perl -lne '/^(\s*\w+){2}\s*(.*?)[\s(]*.xxx_yyy_aaa_01.*$/ && print $2' file3.sql
in
$
$ # IN operator followed by space followed by bracket "("
$ cat file4.sql
SEL elapsedtime ,StartTime,QueryText
FROM     dbc.qry
WHERE    StartTime >= '2010-03-24 20:10:08'
        AND      username in ('xxx_yyy_aaa_01')
ORDER    BY LastRespTime DESC
$
$ perl -lne '/^(\s*\w+){2}\s*(.*?)[\s(]*.xxx_yyy_aaa_01.*$/ && print $2' file4.sql
in
$
$ # IN operator followed by space not followed by bracket "("
$ cat file5.sql
SEL elapsedtime ,StartTime,QueryText
FROM     dbc.qry
WHERE    StartTime >= '2010-03-24 20:10:08'
        AND      username in 'xxx_yyy_aaa_01'
ORDER    BY LastRespTime DESC
$
$ perl -lne '/^(\s*\w+){2}\s*(.*?)[\s(]*.xxx_yyy_aaa_01.*$/ && print $2' file5.sql
in
$
$