DEC Text Processing Utility Data Types

3.7 Pattern Data Type

Given this definition, the following patterns match the same text but are not equal:

pat1 := LINE_BEGIN + ANY ("abc"); pat2 := LINE_BEGIN + this_pat;

3.7.4 Compiling and Executing Patterns

When you execute a DECTPU statement that contains a pattern expression, DECTPU builds an internal representation of the pattern. DECTPU uses the current contents of any buffers or ranges used as arguments to pattern built-ins in the pattern expression to build the internal representation. Later changes to those buffers and ranges do not affect the internal representation for the pattern. DECTPU also uses the current values of any variables used in the pattern expression. Later changes to these variables do not affect the internal representation of the pattern. For example, suppose you wrote the following code fragment:

p1 := "abc";

p2 := "123"; pat := p1 & p2; p1 := "xyz"; SEARCH (pat, FORWARD);

Given this code fragment, the search matches the string "abc123" because the variable pat is evaluated as it is built from p1 and p2 during the assignment statement.

3.7.5 Searching for a Pattern

The SEARCH and SEARCH_QUIETLY built-ins use the following algorithm to find a match for a pattern:

1.Put the internal marker that marks the search position at the starting position for the search. The starting position is determined as follows:

•If you do not specify where to search, search the current buffer, starting at the editing point.

•If you specify a buffer or range where the search is to take place, start at the beginning or end of the buffer or range, depending on the direction of the search.

2.Check whether the pattern matches text, starting at the current search position and extending toward the end of the searched buffer or range. If a range is being searched, the matched text cannot extend beyond the end of that range. If the pattern matches, return a range that contains the matching text and stop searching.

3.If the previous step fails, move the search position one character forward or backward, depending upon the direction of the search. If this is impossible because the search position is at the end or beginning of the searched buffer or range, stop searching. If this step succeeds, repeat the previous step.

Note

This algorithm changes if you specify a reverse search for a pattern starting with SCAN, SPAN, SCANL, or SPANL. For more information, see the descriptions of these built-in procedures in the DEC Text Processing Utility Reference Manual.

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Compaq AA-PWCBD-TE manual Compiling and Executing Patterns, Searching for a Pattern
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