http://www.eclipse.org/tptp/home/downloads/installguide/gla_42/ref/rregexp.html

Regular expression grammar

The Adapter Configuration Editor allows you to use regular expressions to describe how log files should be transformed into Common Base Event records. The following tables are a guideline to regular expression usage.

General rules

| separates alternatives.Expressions within parentheses are matched as subpattern groups and saved for use by certain methods.By default, a quantified subpattern matches as many times as possible without causing the rest of the pattern not to match. To change the quantifiers to match the minimum number of times possible, without causing the rest of the pattern not to match, use a ? right after the quantifier.Perl5 extended regular expressions are fully supported.

 

Regular expression matching

ExpressionMatches{n,m}at least n but not more than m times{n,}at least n times{n}exactly n times*0 or more times+1 or more times?0 or 1 times.everything except \n in a regular expression within parentheses^a null token matching the beginning of a string or line (i.e., the position right after a newline or right before the beginning of a string) in a regular expression within parentheses$a null token matching the end of a string or line (that is, the position right before a newline or right after the end of a string) in a regular expression within parentheses\bbackspace inside a character class ([abcd])\bnull token matching a word boundary (\w on one side and \W on the other)\Bnull token matching a boundary that isn't a word boundary\Aonly at beginning of string\Zonly at end of string (or before newline at the end)\newline\rcarriage return\ttab\fform feed\ddigit [0-9]\Dnon-digit [^0-9]\wword character [0-9a-z_A-Z]\Wnon-word character [^0-9a-z_A-Z]\sa whitespace character [ \t\n\r\f]\Sa non-whitespace character [^ \t\n\r\f]\xnnthe hexadecimal representation of character nn\cDthe corresponding control character\nn or \nnnthe octal representation of character nn unless a backreference.\1, \2, \3...whatever the first, second, third, and so on, parenthesized group matched. This is called a backreference. If there is no corresponding group, the number is interpreted as an octal representation of a character.\0the null character. Any other backslashed character matches itself .*?0 or more times+?1 or more times??0 or 1 times{n}?exactly n times{n,}?at least n times{n,m}?at least n but not more than m times

 

rouping and extracting matches

To group parts of an expression, use the metacharacters ( ). This allows the regular expression in the parentheses to be treated as a single unit. For example, the regular expression

severity:(1|2)

matches the pattern severity:1 or severity:2.

 

转载于:https://www.cnblogs.com/shangdawei/archive/2012/10/21/2732820.html

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