Revision as of 14:23, 16 February 2008 by PepiMK (New page: Algo prefixes allow you to use various string matching algorithms to identif patterns of text. ==Examples== <wc>Hall? Welt <substr>Hallo <bool>Hallo OR Hello <bool>Hallo AND Welt <re...)
Algo prefixes allow you to use various string matching algorithms to identif patterns of text.
<wc>Hall? Welt <substr>Hallo <bool>Hallo OR Hello <bool>Hallo AND Welt <regexpr>[Hh]allo Welt <regexpr>[a-zA-Z]* Welt <bm>Hallo
- wc stands for wildcards and is usually the default if no prefix has been specified. Wildcards are ? (for none or one letter) or * (for one or any larger amount of letters). Much like you might know from console command lines.
- substr stands for substring search and means that any text that includes the specified text will be identified as a match. This is a weak algorithm, open to errors, so use with care if at all.
- bool means boolean comparisons and allows you to use OR and AND to combine various substrings.
- regexpr allows you to use the full power of regular expressions. You can do nearly anything that way, but take care, regular expressions do cost processing time!
- bm stands for the Boyer-Moore string seach algorithm, a power algorithm, most effectively used to search in large texts (you'll also find this algorithm used in the textinstream and bininstream advanced file parameters).