Groups can be named (assume a file of lastname, firstname altered using "preg_replace()") disallow digit AND whitespace occurrences - ? * + rest of phone number means not digit OR whitespace, both match \s whitespace (space, tab, vtab, newline) \W, \D, or \S, (NOT word, digit, or whitespace) All non-capturing means is that you dont intend to count the group as one of the available backreferences (or replacements, in contexts where replacement is an option). ) shorthand classes \w "word" character (letter, digit, or underscore) \d digit Capturing doesnt effect what grep considers to be the matched parts when using the -o or -only-matching option. gr y match gray or grey match any letter or digit (In always escape. Use \ to search for these special characters:Ĭ: \\windows matches c:\windows alternatives - | (OR) cat|dog match cat or dog order matters if short alternative is part of longer id|identity matches id or identityĪs soon as 1st alternative matches identity|id matches id or identity order longer to shorter when alternatives overlap (To match whole words, see scope and groups.) character classes - or match any vowel match a NON vowel r ng match ring, w rangle, sp rung, etc. The capturing group can be described in words as 'the character a followed by a word boundary'. The parts in bold mean that there was a match. REGEX Cheat Sheet GREP cheat sheet characters - what to seek ring matches ring, sp ringboard, ringtone, etc. Below Im issuing the regular expression (ab) 1 to grep and inserting a couple of test strings through stdin.
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