Regular Expressions for Ptsfilter

On this page you will find the details necessary to custom make complex regex patterns for ptsfilter rejection with examples. The four basic types of metacharacters used and listed for composing these patterns are: Single Metacharacters, Quantifiers, Anchors and Escape Characters.

Single-Character Metacharacters: 
  • . Matches any one character.
  • [...] Matches any character listed between the brackets.
  • [^...] Matches any character except those listed between the brackets.
  • Examples:
  • c.t matches "cat" or "cot"
  • ca[sin]o matches "caso", "caio", "cano"
  • mo[^ne]y matches any word with "mo" and "y" in that sequence except for the word "money"
  • * Matches the preceding element zero or more times.
  • The following are "extended" metacharacters which are not available on system 5.4:
  • ? Matches any character element zero or one times.
  • + Matches the preceding element zero or one times.
  • {num} Matches the preceding element num times.
  • {min,max}Matches the preceding element at least min times but no more than max times.
  • Examples:
  • ca?t matches "cat" or "caat"
  • ca*t matches "cat" or "cat" with any number of a's
  • b+ar matches "bar" or "baar"
  • la{3}rge matches "laarge" , "laaarge" or "laaaarge"
  • co{2,4}w matches "cooow" , "coooow" and "cooooow"
  • ^ Matches at the start of the line.
  • $ Matches at the end of the line.
  • \< Matches elements at the beginning of a word.
  • \> Matches elements at the end of a word.
  • \b Matches any word boundary at the beginning or the end of a word.
  • \B Matches any position that isn't a word boundary at the beginning or end of a word.
  • Example:
  • ^boys are.. matches any string or line with "boys" at the beginning
  • ..eating$ matches any string or line with "eating" at the end
  • \<book
  • matches "bookmark" or any word that begins with "book"
  • \>book
  • matches "handbook" or any other word that ends with "book"
  • \bmachine matches the word "machine" and the string its in
  • \Band matches "and" no matter where it appears in the string(ie:"and" matches "hand" , "stand" , "standard")
    Escape Character: 
  • \ Escapes any one metacharacter from its special meaning.
  • Example:
  • \+ matches up a "plus" sign.(ie: + no longer matches preceding element zero or one times)
  • Other Extended Metacharacters:
  • (..|..) Matches either word or phrase inside the parenthesis, to that word or phrase included in a string. EXAMPLE:
  • (wrench|ball) matches any string with either "wrench" or "ball" or both in it
  • (phrase1|phrase2) matches any string with either/or phrase1 or phrase2 in it

  • Some good examples Of regular expression usage:
  • [a-z]{1,3}[a-z]{1,9}
  • catches strings like v<!--748724-->iagra! One users use of Ptsfilter and regular expressions

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    [email protected] .

    Copyright © 2013 ScanMail. All rights reserved.
    last modified on: 07/05/05 10:49:18 AM

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