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-<?xml version="1.0" encoding="utf-8"?>
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-<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
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-"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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-<html xmlns="http://www.w3.org/1999/xhtml" lang="en" xml:lang="en">
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-<head>
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-<!-- 2022-11-12 Sat 04:46 -->
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-<meta name="viewport" content="width=device-width, initial-scale=1" />
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-<title>Grep Patterns … things I never knew.</title>
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-<meta name="author" content="George M Jones" />
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-<meta name="generator" content="Org Mode" />
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- }
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- /* additional language identifiers per "defun org-babel-execute"
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- in ob-*.el */
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- /* additional language identifiers from org-babel-shell-names in
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- /* Additional Emacs modes also supported by the LaTeX listings package */
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- pre.src-nxml:before { content: 'XML'; }
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- /* add a generic configuration mode; LaTeX export needs an additional
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- (add-to-list 'org-latex-listings-langs '(conf " ")) in .emacs */
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- pre.src-conf:before { content: 'Configuration File'; }
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-
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- table { border-collapse:collapse; }
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- dt { font-weight: bold; }
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- display: table;
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- width: 100%;
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- }
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- .equation {
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- }
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- text-align: right;
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- vertical-align: middle;
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- }
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- .inlinetask {
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- padding: 10px;
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- border: 2px solid gray;
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- margin: 10px;
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- background: #ffffcc;
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- }
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- #org-div-home-and-up
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- { text-align: right; font-size: 70%; white-space: nowrap; }
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- textarea { overflow-x: auto; }
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- .linenr { font-size: smaller }
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- .code-highlighted { background-color: #ffff00; }
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- #org-info-js_console-label
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- { font-size: 10px; font-weight: bold; white-space: nowrap; }
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- .org-info-js_search-highlight
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- { background-color: #ffff00; color: #000000; font-weight: bold; }
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- .org-svg { }
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-</style>
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-</head>
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-<body>
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-<div id="preamble" class="status">
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-<h1 class="title">Grep Patterns … things I never knew.</h1>
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- <p class="subtitle"></p>
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- <br>
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- <p class="subtitle">George M Jones</p>
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- <p class="subtitle"><a href="mailto:gmj@pobox.com">gmj@pobox.com</a></p>
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- <p class="subtitle"></p>
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-</div>
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-<div id="content" class="content">
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-<h1 class="title">Grep Patterns … things I never knew.</h1>
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-<p>
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-This was an exercise to understand GNU grep regular expressions and
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-options.
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-</p>
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-
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-<p>
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-<a href="https://man7.org/linux/man-pages/man1/grep.1.html">https://man7.org/linux/man-pages/man1/grep.1.html</a>
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-</p>
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-
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-<pre class="example" id="org94cd5ca">
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-
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-#
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-# The normal use cases
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-#
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-
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-# A file to grep
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-$ cat foo.txt
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-foo
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-foo foo
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-foo bar
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-foo bar baz
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-foo|bar|ba
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-
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-# basic regexs (-G) by default. '|' NOT special.
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-$ grep 'bar|baz' foo.txt
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-foo|bar|baz
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-
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-# same
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-$ grep -e 'bar|baz' foo.txt
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-foo|bar|baz
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-
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-# basic regexps. '\' to make '|' "special"
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-$ grep 'bar\|baz' foo.txt
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-foo bar
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-foo bar baz
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-foo|bar|baz
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-
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-# extended expressions. '|' IS special.
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-$ grep -E 'bar|baz' foo.txt
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-foo bar
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-foo bar baz
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-foo|bar|baz
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-
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-#
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-# The suprizing truth about "-e|--regexp"
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-#
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-
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-# -e (and --regex ) specify PATTERNs, NOT regexps
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-#
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-# "-e 'bar|baz'" specifies 'bar|baz' as a PATTERN NOT a regexp.
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-#
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-# The (non-)interpretation of patterns as regexps
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-# comes from the use of -G (default), -E, -F or -P
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-#
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-# In this example it is a basic regex because -G is implied.
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-#
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-$ grep -e 'bar|baz' foo.txt
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-foo|bar|baz
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-
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-
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-#
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-# newlines to separate patterns. Who knew?
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-#
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-
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-# per the man page:
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-# NAME
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-# grep - print lines that match patterns
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-#
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-# SYNOPSIS
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-# grep [OPTION...] PATTERNS [FILE...]
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-#
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-# DESCRIPTION
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-# grep searches for PATTERNS in each FILE. PATTERNS is one or more
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-# patterns separated by newline characters,
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-# ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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-#
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-
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-$ grep `printf 'bar\nbaz'` foo.txt
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-foo.txt:foo bar
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-foo.txt:foo bar baz
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-foo.txt:foo|bar|baz
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-</pre>
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-</div>
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-</body>
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-</html>
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