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Top Forums Shell Programming and Scripting Search for a text between two strings in a file using regex Post 303043158 by Neo on Monday 20th of January 2020 07:09:18 AM
Old 01-20-2020
This would be easy if you did not try to make these text processing tasks "one liners" and just write
the (few lines) code to process the file one line at a time, using any programming language you like.

Basically, if you just processed this text in a loop, reading each line at a time, matching flags and setting patterns, you could have easily processed this file. (Or read the file into an array of lines of text.)

The issue, as I see it, is you (not only you, but many) are falling into the "trap" of looking for "one liners" instead of just writing a small program of a few lines which does the trick.

You are not the only person who falls in to the trap of thinking that everything has to be a "one liner" but this will cause you to waste time when you could write a few lines of code in any programming language and most shell scripts to:
  • Read the file into an array of lines.
  • Process each line and search for your beginning <VirtualHost tag and set a flag.
  • When the flag is set, search and match the other string(s) (SSLInsecureRenegotiation ... blah blah) and put the match(es) in an array.
  • Stop processing after the end tag </VirtualHost is matched.

This is only a few lines of code and is very easy for you (or anyone with minimal programming skills) to write and you could have easily written this code in the time it takes to search for a "one liners" to do the job.

I'm not trying to give you a hard time and I like your posts; but I'm just saying. For a guy with nearly 1000 posts here; you should just write a handful of lines of code and process this versus wasting your time searching for the perfect "one-liner" REGEX.

Cheers.
 

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CREATE TEXT SEARCH 
PARSER(7) PostgreSQL 9.2.7 Documentation CREATE TEXT SEARCH PARSER(7) NAME
CREATE_TEXT_SEARCH_PARSER - define a new text search parser SYNOPSIS
CREATE TEXT SEARCH PARSER name ( START = start_function , GETTOKEN = gettoken_function , END = end_function , LEXTYPES = lextypes_function [, HEADLINE = headline_function ] ) DESCRIPTION
CREATE TEXT SEARCH PARSER creates a new text search parser. A text search parser defines a method for splitting a text string into tokens and assigning types (categories) to the tokens. A parser is not particularly useful by itself, but must be bound into a text search configuration along with some text search dictionaries to be used for searching. If a schema name is given then the text search parser is created in the specified schema. Otherwise it is created in the current schema. You must be a superuser to use CREATE TEXT SEARCH PARSER. (This restriction is made because an erroneous text search parser definition could confuse or even crash the server.) Refer to Chapter 12, Full Text Search, in the documentation for further information. PARAMETERS
name The name of the text search parser to be created. The name can be schema-qualified. start_function The name of the start function for the parser. gettoken_function The name of the get-next-token function for the parser. end_function The name of the end function for the parser. lextypes_function The name of the lextypes function for the parser (a function that returns information about the set of token types it produces). headline_function The name of the headline function for the parser (a function that summarizes a set of tokens). The function names can be schema-qualified if necessary. Argument types are not given, since the argument list for each type of function is predetermined. All except the headline function are required. The arguments can appear in any order, not only the one shown above. COMPATIBILITY
There is no CREATE TEXT SEARCH PARSER statement in the SQL standard. SEE ALSO
ALTER TEXT SEARCH PARSER (ALTER_TEXT_SEARCH_PARSER(7)), DROP TEXT SEARCH PARSER (DROP_TEXT_SEARCH_PARSER(7)) PostgreSQL 9.2.7 2014-02-17 CREATE TEXT SEARCH PARSER(7)
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