Error extracting 1 or more numbers with expr command


 
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Old 05-04-2009
Error extracting 1 or more numbers with expr command

Need help with the following, I want to extract the digits from the following file pattern
using the expr command. digits are in the range 1-99

Tried two different methods, not sure what I am doing wrong.

file1=file1.dbf
file10=file10.dbf

Works for

expr "$file10" : '.*\([0-9][0-9]\)'
10

But not for

expr "$file1" : '.*\([0-9][0-9]\)'
<blank>

Tried to use the repitition operator but once again did not work as expected.
Incorrectly extracts the second digit only.

expr "$file10" : '.*\([0-9]\{1,2\}\)'
0

Repetition operator accepts the minimum value.
This was confirmed with the following ...

expr "$file10" : '.*\([0-9]\{2\}\)'
10
 
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SQL::Translator::Parser::SQLite(3pm)			User Contributed Perl Documentation		      SQL::Translator::Parser::SQLite(3pm)

NAME
SQL::Translator::Parser::SQLite - parser for SQLite SYNOPSIS
use SQL::Translator; use SQL::Translator::Parser::SQLite; my $translator = SQL::Translator->new; $translator->parser("SQL::Translator::Parser::SQLite"); DESCRIPTION
This is a grammar for parsing CREATE statements for SQLite as described here: http://www.sqlite.org/lang.html CREATE INDEX sql-statement ::= CREATE [TEMP | TEMPORARY] [UNIQUE] INDEX index-name ON [database-name .] table-name ( column-name [, column-name]* ) [ ON CONFLICT conflict-algorithm ] column-name ::= name [ ASC | DESC ] CREATE TABLE sql-command ::= CREATE [TEMP | TEMPORARY] TABLE table-name ( column-def [, column-def]* [, constraint]* ) sql-command ::= CREATE [TEMP | TEMPORARY] TABLE table-name AS select-statement column-def ::= name [type] [[CONSTRAINT name] column-constraint]* type ::= typename | typename ( number ) | typename ( number , number ) column-constraint ::= NOT NULL [ conflict-clause ] | PRIMARY KEY [sort-order] [ conflict-clause ] | UNIQUE [ conflict-clause ] | CHECK ( expr ) [ conflict-clause ] | DEFAULT value constraint ::= PRIMARY KEY ( name [, name]* ) [ conflict-clause ]| UNIQUE ( name [, name]* ) [ conflict-clause ] | CHECK ( expr ) [ conflict-clause ] conflict-clause ::= ON CONFLICT conflict-algorithm CREATE TRIGGER sql-statement ::= CREATE [TEMP | TEMPORARY] TRIGGER trigger-name [ BEFORE | AFTER ] database-event ON [database-name .] table-name trigger-action sql-statement ::= CREATE [TEMP | TEMPORARY] TRIGGER trigger-name INSTEAD OF database-event ON [database-name .] view-name trigger-action database-event ::= DELETE | INSERT | UPDATE | UPDATE OF column-list trigger-action ::= [ FOR EACH ROW | FOR EACH STATEMENT ] [ WHEN expression ] BEGIN trigger-step ; [ trigger-step ; ]* END trigger-step ::= update-statement | insert-statement | delete-statement | select-statement CREATE VIEW sql-command ::= CREATE [TEMP | TEMPORARY] VIEW view-name AS select-statement ON CONFLICT clause conflict-clause ::= ON CONFLICT conflict-algorithm conflict-algorithm ::= ROLLBACK | ABORT | FAIL | IGNORE | REPLACE expression expr ::= expr binary-op expr | expr like-op expr | unary-op expr | ( expr ) | column-name | table-name . column-name | database-name . table-name . column-name | literal-value | function-name ( expr-list | * ) | expr (+) | expr ISNULL | expr NOTNULL | expr [NOT] BETWEEN expr AND expr | expr [NOT] IN ( value-list ) | expr [NOT] IN ( select-statement ) | ( select-statement ) | CASE [expr] ( WHEN expr THEN expr )+ [ELSE expr] END like-op::= LIKE | GLOB | NOT LIKE | NOT GLOB AUTHOR
Ken Youens-Clark <kclark@cpan.org>. SEE ALSO
perl(1), Parse::RecDescent, SQL::Translator::Schema. perl v5.14.2 2012-01-18 SQL::Translator::Parser::SQLite(3pm)