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Top Forums Shell Programming and Scripting What's the difference between \d , [:digit:], and [0-9] in regular expression ? Post 302551895 by 915086731 on Thursday 1st of September 2011 04:12:35 AM
Old 09-01-2011
Thanks, what represents for word boundary in the bash shell if it isn't "\b" ?

---------- Post updated at 03:12 AM ---------- Previous update was at 03:04 AM ----------

Thanks all!
The following works ok in bash shell:
Code:
[river@localhost ~]$ [[ "123" =~ [[:digit:]]{3} ]] && echo "ok" || echo "error"
ok
[river@localhost ~]$ [[ "123" =~ [0-9]{3} ]] && echo "ok" || echo "error"
ok

The following is what I want:
Code:
[river@localhost ~]$ reg='\b[0-9]{3}\b'
[river@localhost ~]$ [[ "123" =~ $reg ]] && echo "ok" || echo "error"
ok

However, why I must put the expression in a variable .
Code:
[river@localhost ~]$ [[ "123" =~ \b[0-9]{3}\b ]] && echo "ok" || echo "error"
error

 

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MSGFMT_FORMAT_MESSAGE(3)						 1						  MSGFMT_FORMAT_MESSAGE(3)

MessageFormatter::formatMessage - Quick format message

	Object oriented style

SYNOPSIS
publicstatic string MessageFormatter::formatMessage (string $locale, string $pattern, array $args) DESCRIPTION
Procedural style string msgfmt_format_message (string $locale, string $pattern, array $args) Quick formatting function that formats the string without having to explicitly create the formatter object. Use this function when the format operation is done only once and does not need and parameters or state to be kept. PARAMETERS
o $locale - The locale to use for formatting locale-dependent parts o $pattern - The pattern string to insert things into. The pattern uses an 'apostrophe-friendly' syntax; it is run through umsg_autoQuoteA- postrophe before being interpreted. o $args - The array of values to insert into the format string RETURN VALUES
The formatted pattern string or FALSE if an error occurred EXAMPLES
Example #1 msgfmt_format_message(3) example <?php echo msgfmt_format_message("en_US", "{0,number,integer} monkeys on {1,number,integer} trees make {2,number} monkeys per tree ", array(4560, 123, 4560/123)); echo msgfmt_format_message("de", "{0,number,integer} Affen auf {1,number,integer} Baumen sind {2,number} Affen pro Baum ", array(4560, 123, 4560/123)); ?> Example #2 OO example <?php echo MessageFormatter::formatMessage("en_US", "{0,number,integer} monkeys on {1,number,integer} trees make {2,number} monkeys per tree ", array(4560, 123, 4560/123)); echo MessageFormatter::formatMessage("de", "{0,number,integer} Affen auf {1,number,integer} Baumen sind {2,number} Affen pro Baum ", array(4560, 123, 4560/123)); ?> The above example will output: 4,560 monkeys on 123 trees make 37.073 monkeys per tree 4.560 Affen auf 123 Baumen sind 37,073 Affen pro Baum SEE ALSO
msgfmt_create(3), msgfmt_parse(3), msgfmt_get_error_code(3), msgfmt_get_error_message(3). PHP Documentation Group MSGFMT_FORMAT_MESSAGE(3)
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