If you want to go further you can construct the match object and return it instead, so the use of this helper will be more handy.Īnd the performance of this function can of course also be optimized, this example is just to show the path to a solution. A common way to get context about howor whya pattern appears in a file is to view the line above the match, or the line just. For example: grep -only-matching -line-number Fedora example.txt 2:Fedora. Print(regex_search_ignore_space('lion', with_spaces)) For added context, use the -line-number option ( -n for short) to see the line number where the matched pattern appears in the file. Start = char_positions # in the original stringĮnd = char_positions # in the original string Should Perl-compatible regexps be used value if FALSE, a vector containing the ( integer ) indices of the matches determined by grep is returned, and if TRUE, a vector containing the matching elements themselves is returned. # of the found string in the spaceless string ignore.case if FALSE, the pattern matching is case sensitive and if TRUE, case is ignored during matching. # match.start() and match.end() are indices of start and end In this article, we explored popular tools such as sed and awk to grep without leading whitespace. If re.match(r'\S', char): # upper \S matches non-whitespace chars
You can strip the whitespace beforehand AND save the positions of non-whitespace characters so you can use them later to find out the matched string boundary positions in the original string like the following: def regex_search_ignore_space(regex, string): (the following exemplary solution is in python, although obviously it can be ported to any language): This approach can be used to automate this
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