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This answer suggests that grep -P supports the (?:pattern) syntax, but it doesn't seem to work for me (the group is still captured and displayed as part of the match). Am I missing something?
I am trying grep -oP "(?:syntaxHighlighterConfig\.)[a-zA-Z]+Color" SyntaxHighlighter.js on this code, and expect the results to be:
wikilinkColor externalLinkColor parameterColor ... but instead I get:
syntaxHighlighterConfig.wikilinkColor syntaxHighlighterConfig.externalLinkColor syntaxHighlighterConfig.parameterColor ... 
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Although they don't save the matched character sequence, non-capturing groups can alter pattern matching modifiers within the group. Some non-capturing groups can even discard backtracking information after a successful sub-pattern match.
Groups group multiple patterns as a whole, and capturing groups provide extra submatch information when using a regular expression pattern to match against a string. Backreferences refer to a previously captured group in the same regular expression.
"Non-capturing" doesn't mean that the group isn't part of the match; it means that the group's value isn't saved for use in back-references. What you are looking for is a look-behind zero-width assertion:
grep -Po "(?<=syntaxHighlighterConfig\.)[a-zA-Z]+Color" file If you love us? You can donate to us via Paypal or buy me a coffee so we can maintain and grow! Thank you!
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