diff options
Diffstat (limited to 'srclib/pcre/doc/pcretest.html')
| -rw-r--r-- | srclib/pcre/doc/pcretest.html | 369 |
1 files changed, 0 insertions, 369 deletions
diff --git a/srclib/pcre/doc/pcretest.html b/srclib/pcre/doc/pcretest.html deleted file mode 100644 index 918e6dec2b..0000000000 --- a/srclib/pcre/doc/pcretest.html +++ /dev/null @@ -1,369 +0,0 @@ -<HTML> -<HEAD> -<TITLE>pcretest specification</TITLE> -</HEAD> -<body bgcolor="#FFFFFF" text="#00005A"> -<H1>pcretest specification</H1> -This HTML document has been generated automatically from the original man page. -If there is any nonsense in it, please consult the man page in case the -conversion went wrong. -<UL> -<LI><A NAME="TOC1" HREF="#SEC1">NAME</A> -<LI><A NAME="TOC2" HREF="#SEC2">SYNOPSIS</A> -<LI><A NAME="TOC3" HREF="#SEC3">OPTIONS</A> -<LI><A NAME="TOC4" HREF="#SEC4">DESCRIPTION</A> -<LI><A NAME="TOC5" HREF="#SEC5">PATTERN MODIFIERS</A> -<LI><A NAME="TOC6" HREF="#SEC6">DATA LINES</A> -<LI><A NAME="TOC7" HREF="#SEC7">OUTPUT FROM PCRETEST</A> -<LI><A NAME="TOC8" HREF="#SEC8">AUTHOR</A> -</UL> -<LI><A NAME="SEC1" HREF="#TOC1">NAME</A> -<P> -pcretest - a program for testing Perl-compatible regular expressions. -</P> -<LI><A NAME="SEC2" HREF="#TOC1">SYNOPSIS</A> -<P> -<B>pcretest [-d] [-i] [-m] [-o osize] [-p] [-t] [source] [destination]</B> -</P> -<P> -<B>pcretest</B> was written as a test program for the PCRE regular expression -library itself, but it can also be used for experimenting with regular -expressions. This man page describes the features of the test program; for -details of the regular expressions themselves, see the <B>pcre</B> man page. -</P> -<LI><A NAME="SEC3" HREF="#TOC1">OPTIONS</A> -<P> -<B>-d</B> -Behave as if each regex had the <B>/D</B> modifier (see below); the internal -form is output after compilation. -</P> -<P> -<B>-i</B> -Behave as if each regex had the <B>/I</B> modifier; information about the -compiled pattern is given after compilation. -</P> -<P> -<B>-m</B> -Output the size of each compiled pattern after it has been compiled. This is -equivalent to adding /M to each regular expression. For compatibility with -earlier versions of pcretest, <B>-s</B> is a synonym for <B>-m</B>. -</P> -<P> -<B>-o</B> <I>osize</I> -Set the number of elements in the output vector that is used when calling PCRE -to be <I>osize</I>. The default value is 45, which is enough for 14 capturing -subexpressions. The vector size can be changed for individual matching calls by -including \O in the data line (see below). -</P> -<P> -<B>-p</B> -Behave as if each regex has <B>/P</B> modifier; the POSIX wrapper API is used -to call PCRE. None of the other options has any effect when <B>-p</B> is set. -</P> -<P> -<B>-t</B> -Run each compile, study, and match 20000 times with a timer, and output -resulting time per compile or match (in milliseconds). Do not set <B>-t</B> with -<B>-m</B>, because you will then get the size output 20000 times and the timing -will be distorted. -</P> -<LI><A NAME="SEC4" HREF="#TOC1">DESCRIPTION</A> -<P> -If <B>pcretest</B> is given two filename arguments, it reads from the first and -writes to the second. If it is given only one filename argument, it reads from -that file and writes to stdout. Otherwise, it reads from stdin and writes to -stdout, and prompts for each line of input, using "re>" to prompt for regular -expressions, and "data>" to prompt for data lines. -</P> -<P> -The program handles any number of sets of input on a single input file. Each -set starts with a regular expression, and continues with any number of data -lines to be matched against the pattern. An empty line signals the end of the -data lines, at which point a new regular expression is read. The regular -expressions are given enclosed in any non-alphameric delimiters other than -backslash, for example -</P> -<P> -<PRE> - /(a|bc)x+yz/ -</PRE> -</P> -<P> -White space before the initial delimiter is ignored. A regular expression may -be continued over several input lines, in which case the newline characters are -included within it. It is possible to include the delimiter within the pattern -by escaping it, for example -</P> -<P> -<PRE> - /abc\/def/ -</PRE> -</P> -<P> -If you do so, the escape and the delimiter form part of the pattern, but since -delimiters are always non-alphameric, this does not affect its interpretation. -If the terminating delimiter is immediately followed by a backslash, for -example, -</P> -<P> -<PRE> - /abc/\ -</PRE> -</P> -<P> -then a backslash is added to the end of the pattern. This is done to provide a -way of testing the error condition that arises if a pattern finishes with a -backslash, because -</P> -<P> -<PRE> - /abc\/ -</PRE> -</P> -<P> -is interpreted as the first line of a pattern that starts with "abc/", causing -pcretest to read the next line as a continuation of the regular expression. -</P> -<LI><A NAME="SEC5" HREF="#TOC1">PATTERN MODIFIERS</A> -<P> -The pattern may be followed by <B>i</B>, <B>m</B>, <B>s</B>, or <B>x</B> to set the -PCRE_CASELESS, PCRE_MULTILINE, PCRE_DOTALL, or PCRE_EXTENDED options, -respectively. For example: -</P> -<P> -<PRE> - /caseless/i -</PRE> -</P> -<P> -These modifier letters have the same effect as they do in Perl. There are -others which set PCRE options that do not correspond to anything in Perl: -<B>/A</B>, <B>/E</B>, and <B>/X</B> set PCRE_ANCHORED, PCRE_DOLLAR_ENDONLY, and -PCRE_EXTRA respectively. -</P> -<P> -Searching for all possible matches within each subject string can be requested -by the <B>/g</B> or <B>/G</B> modifier. After finding a match, PCRE is called -again to search the remainder of the subject string. The difference between -<B>/g</B> and <B>/G</B> is that the former uses the <I>startoffset</I> argument to -<B>pcre_exec()</B> to start searching at a new point within the entire string -(which is in effect what Perl does), whereas the latter passes over a shortened -substring. This makes a difference to the matching process if the pattern -begins with a lookbehind assertion (including \b or \B). -</P> -<P> -If any call to <B>pcre_exec()</B> in a <B>/g</B> or <B>/G</B> sequence matches an -empty string, the next call is done with the PCRE_NOTEMPTY and PCRE_ANCHORED -flags set in order to search for another, non-empty, match at the same point. -If this second match fails, the start offset is advanced by one, and the normal -match is retried. This imitates the way Perl handles such cases when using the -<B>/g</B> modifier or the <B>split()</B> function. -</P> -<P> -There are a number of other modifiers for controlling the way <B>pcretest</B> -operates. -</P> -<P> -The <B>/+</B> modifier requests that as well as outputting the substring that -matched the entire pattern, pcretest should in addition output the remainder of -the subject string. This is useful for tests where the subject contains -multiple copies of the same substring. -</P> -<P> -The <B>/L</B> modifier must be followed directly by the name of a locale, for -example, -</P> -<P> -<PRE> - /pattern/Lfr -</PRE> -</P> -<P> -For this reason, it must be the last modifier letter. The given locale is set, -<B>pcre_maketables()</B> is called to build a set of character tables for the -locale, and this is then passed to <B>pcre_compile()</B> when compiling the -regular expression. Without an <B>/L</B> modifier, NULL is passed as the tables -pointer; that is, <B>/L</B> applies only to the expression on which it appears. -</P> -<P> -The <B>/I</B> modifier requests that <B>pcretest</B> output information about the -compiled expression (whether it is anchored, has a fixed first character, and -so on). It does this by calling <B>pcre_fullinfo()</B> after compiling an -expression, and outputting the information it gets back. If the pattern is -studied, the results of that are also output. -</P> -<P> -The <B>/D</B> modifier is a PCRE debugging feature, which also assumes <B>/I</B>. -It causes the internal form of compiled regular expressions to be output after -compilation. -</P> -<P> -The <B>/S</B> modifier causes <B>pcre_study()</B> to be called after the -expression has been compiled, and the results used when the expression is -matched. -</P> -<P> -The <B>/M</B> modifier causes the size of memory block used to hold the compiled -pattern to be output. -</P> -<P> -The <B>/P</B> modifier causes <B>pcretest</B> to call PCRE via the POSIX wrapper -API rather than its native API. When this is done, all other modifiers except -<B>/i</B>, <B>/m</B>, and <B>/+</B> are ignored. REG_ICASE is set if <B>/i</B> is -present, and REG_NEWLINE is set if <B>/m</B> is present. The wrapper functions -force PCRE_DOLLAR_ENDONLY always, and PCRE_DOTALL unless REG_NEWLINE is set. -</P> -<P> -The <B>/8</B> modifier causes <B>pcretest</B> to call PCRE with the PCRE_UTF8 -option set. This turns on the (currently incomplete) support for UTF-8 -character handling in PCRE, provided that it was compiled with this support -enabled. This modifier also causes any non-printing characters in output -strings to be printed using the \x{hh...} notation if they are valid UTF-8 -sequences. -</P> -<LI><A NAME="SEC6" HREF="#TOC1">DATA LINES</A> -<P> -Before each data line is passed to <B>pcre_exec()</B>, leading and trailing -whitespace is removed, and it is then scanned for \ escapes. The following are -recognized: -</P> -<P> -<PRE> - \a alarm (= BEL) - \b backspace - \e escape - \f formfeed - \n newline - \r carriage return - \t tab - \v vertical tab - \nnn octal character (up to 3 octal digits) - \xhh hexadecimal character (up to 2 hex digits) - \x{hh...} hexadecimal UTF-8 character -</PRE> -</P> -<P> -<PRE> - \A pass the PCRE_ANCHORED option to <B>pcre_exec()</B> - \B pass the PCRE_NOTBOL option to <B>pcre_exec()</B> - \Cdd call pcre_copy_substring() for substring dd - after a successful match (any decimal number - less than 32) - \Gdd call pcre_get_substring() for substring dd - after a successful match (any decimal number - less than 32) - \L call pcre_get_substringlist() after a - successful match - \N pass the PCRE_NOTEMPTY option to <B>pcre_exec()</B> - \Odd set the size of the output vector passed to - <B>pcre_exec()</B> to dd (any number of decimal - digits) - \Z pass the PCRE_NOTEOL option to <B>pcre_exec()</B> -</PRE> -</P> -<P> -When \O is used, it may be higher or lower than the size set by the <B>-O</B> -option (or defaulted to 45); \O applies only to the call of <B>pcre_exec()</B> -for the line in which it appears. -</P> -<P> -A backslash followed by anything else just escapes the anything else. If the -very last character is a backslash, it is ignored. This gives a way of passing -an empty line as data, since a real empty line terminates the data input. -</P> -<P> -If <B>/P</B> was present on the regex, causing the POSIX wrapper API to be used, -only <B>\B</B>, and <B>\Z</B> have any effect, causing REG_NOTBOL and REG_NOTEOL -to be passed to <B>regexec()</B> respectively. -</P> -<P> -The use of \x{hh...} to represent UTF-8 characters is not dependent on the use -of the <B>/8</B> modifier on the pattern. It is recognized always. There may be -any number of hexadecimal digits inside the braces. The result is from one to -six bytes, encoded according to the UTF-8 rules. -</P> -<LI><A NAME="SEC7" HREF="#TOC1">OUTPUT FROM PCRETEST</A> -<P> -When a match succeeds, pcretest outputs the list of captured substrings that -<B>pcre_exec()</B> returns, starting with number 0 for the string that matched -the whole pattern. Here is an example of an interactive pcretest run. -</P> -<P> -<PRE> - $ pcretest - PCRE version 2.06 08-Jun-1999 -</PRE> -</P> -<P> -<PRE> - re> /^abc(\d+)/ - data> abc123 - 0: abc123 - 1: 123 - data> xyz - No match -</PRE> -</P> -<P> -If the strings contain any non-printing characters, they are output as \0x -escapes, or as \x{...} escapes if the <B>/8</B> modifier was present on the -pattern. If the pattern has the <B>/+</B> modifier, then the output for -substring 0 is followed by the the rest of the subject string, identified by -"0+" like this: -</P> -<P> -<PRE> - re> /cat/+ - data> cataract - 0: cat - 0+ aract -</PRE> -</P> -<P> -If the pattern has the <B>/g</B> or <B>/G</B> modifier, the results of successive -matching attempts are output in sequence, like this: -</P> -<P> -<PRE> - re> /\Bi(\w\w)/g - data> Mississippi - 0: iss - 1: ss - 0: iss - 1: ss - 0: ipp - 1: pp -</PRE> -</P> -<P> -"No match" is output only if the first match attempt fails. -</P> -<P> -If any of the sequences <B>\C</B>, <B>\G</B>, or <B>\L</B> are present in a -data line that is successfully matched, the substrings extracted by the -convenience functions are output with C, G, or L after the string number -instead of a colon. This is in addition to the normal full list. The string -length (that is, the return from the extraction function) is given in -parentheses after each string for <B>\C</B> and <B>\G</B>. -</P> -<P> -Note that while patterns can be continued over several lines (a plain ">" -prompt is used for continuations), data lines may not. However newlines can be -included in data by means of the \n escape. -</P> -<LI><A NAME="SEC8" HREF="#TOC1">AUTHOR</A> -<P> -Philip Hazel <ph10@cam.ac.uk> -<BR> -University Computing Service, -<BR> -New Museums Site, -<BR> -Cambridge CB2 3QG, England. -<BR> -Phone: +44 1223 334714 -</P> -<P> -Last updated: 15 August 2001 -<BR> -Copyright (c) 1997-2001 University of Cambridge. |