Regular Expressions: Difference between revisions
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(→Examples: Added "VMHBA LUN ID") |
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''' <code> (?<=\[)(.*?)(?=\]) </code> ''' | ''' <code> (?<=\[)(.*?)(?=\]) </code> ''' | ||
Matches everything between <code> [ </code> and <code> ] </code>, so for example... | Matches everything between <code> [ </code> and <code> ]</code>, so for example... | ||
* <code> VMFS_SCSI_DS_01 </code> is matched from <code> [VMFS_SCSI_DS_01] My_VM/MyVM.vmdk | * <code> VMFS_SCSI_DS_01 </code> is matched from <code> [VMFS_SCSI_DS_01] My_VM/MyVM.vmdk | ||
Its essentially done via three chunks of the regex... | Its essentially done via three chunks of the regex... | ||
# <code> (?<=\[) </code> | # <code><nowiki> (?<=\[) </nowiki></code> | ||
#* Requires that <code> [ </code> immediately proceeds the match | #* Requires that <code> [ </code> immediately proceeds the match | ||
# <code> (.*?) </code> | # <code> (.*?) </code> | ||
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# <code> (?=\]) </code> | # <code> (?=\]) </code> | ||
#* Requires that <code> [ </code> immediately follows the match | #* Requires that <code> [ </code> immediately follows the match | ||
=== VMHBA LUN ID === | |||
'''<code> (?<=:)([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])$ </code> | |||
Finds a number between 0 and 255 immediately after a <code>:</code> at the end of a line, specifically intended to get the LUN ID from a VMware canonical path, so for example... | |||
* <code>13</code> is matched from <code>vmhba3:0:13</code> | |||
Stepping through the regex... | |||
# <code><nowiki> (?<=:) </nowiki></code> | |||
#* Requires that <code> : </code> immediately proceeds the match | |||
# <code>([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])</code> | |||
#* Matches any number between 0 and 255 | |||
# <code>$</code> | |||
#* Ensures that the proceeding match occurs at the end of a line | |||
Revision as of 11:48, 12 November 2010
Useful/Standard RegEx
| Matches | Expression |
|---|---|
| IP Address | ^\b((25[0-5]|2[0-4]\d|[01]\d\d|\d?\d)\.){3}(25[0-5]|2[0-4]\d|[01]\d\d|\d?\d)\b
|
| Hostname (no domain) | \A(\w|-)+
|
| Email address | \b[A-Z0-9._%+-]+@[A-Z0-9.-]+\.[A-Z]{2,4}\b
|
Examples
Logfile Name
\d{4}-[A-Za-z]{3}-Week\d{1}.log
Example matches...
2010-Feb-Week4.log2009-Dec-Week2.log1234-aBc-Week0.log
Between Parentheses
(?<=\[)(.*?)(?=\])
Matches everything between [ and ], so for example...
VMFS_SCSI_DS_01is matched from[VMFS_SCSI_DS_01] My_VM/MyVM.vmdk
Its essentially done via three chunks of the regex...
(?<=\[)
- Requires that
[ immediately proceeds the match
(.*?)
- Matches everything
(?=\])
- Requires that
[ immediately follows the match
VMHBA LUN ID
(?<=:)([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])$
Finds a number between 0 and 255 immediately after a : at the end of a line, specifically intended to get the LUN ID from a VMware canonical path, so for example...
13 is matched from vmhba3:0:13
Stepping through the regex...
(?<=:)
- Requires that
: immediately proceeds the match
([01]?[0-9]?[0-9]|2[0-4][0-9]|25[0-5])
- Matches any number between 0 and 255
$
- Ensures that the proceeding match occurs at the end of a line