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Which regular expression should I use with the command grep if I wanted to match the text contained within the tag <div class="Message"> and its closing tag </div> in an HTML file?
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The preg_match() function is the best option to extract text between HTML tags with REGEX in PHP. If you want to get content between tags, use regular expressions with preg_match() function in PHP. You can also extract the content inside element based on class name or ID using PHP.
GNU grep supports three regular expression syntaxes, Basic, Extended, and Perl-compatible. In its simplest form, when no regular expression type is given, grep interpret search patterns as basic regular expressions. To interpret the pattern as an extended regular expression, use the -E ( or --extended-regexp ) option.
To display only the lines that do not match a search pattern, use the -v ( or --invert-match ) option. The -w option tells grep to return only those lines where the specified string is a whole word (enclosed by non-word characters). By default, grep is case-sensitive.
Here's one way using GNU grep:
grep -oP '(?<=<div class="Message"> ).*?(?= </div>)' file
If your tags span multiple lines, try:
< file tr -d '\n' | grep -oP '(?<=<div class="Message"> ).*?(?= </div>)'
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