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See also a lot of general hints and useful links at the regex tag details page<\/strong>.<\/p>\n Online tutorials<\/strong><\/p>\n Quantifiers<\/strong><\/p>\n Character Classes<\/strong><\/p>\n Escape Sequences<\/strong><\/p>\n Anchors<\/strong><\/p>\n
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*<\/code>:greedy, *?<\/code>:reluctant, *+<\/code>:possessive<\/li>\n+<\/code>:greedy, +?<\/code>:reluctant, ++<\/code>:possessive<\/li>\n?<\/code>:optional (zero-or-one)<\/li>\n{n,m}<\/code>:between n & m, {n,}<\/code>:n-or-more, {n}<\/code>:exactly n<\/li>\n\n
{n}<\/code> and {n}?<\/code><\/li>\n\n
[...]<\/code>: any one character, [^...]<\/code>: negated\/any character but<\/li>\n[^]<\/code> matches any one character including<\/em> newlines javascript<\/li>\n[\\w-[\\d]]<\/code> \/ [a-z-[qz]]<\/code>: set subtraction .net, xml-schema, xpath, JGSoft<\/li>\n[\\w&&[^\\d]]<\/code>: set intersection java, ruby 1.9+<\/li>\n[[:alpha:]]<\/code>:POSIX character classes<\/li>\n[[:<:]]<\/code> and [[:>:]]<\/code> Word boundaries<\/li>\n[^\\\\D2]<\/code>, [^[^0-9]2]<\/code>, [^2[^0-9]]<\/code> get different results in Java? java<\/li>\n\n
\\d<\/code>:digit, \\D<\/code>:non-digit<\/li>\n\\w<\/code>:word character, \\W<\/code>:non-word character<\/li>\n\\s<\/code>:whitespace, \\S<\/code>:non-whitespace<\/li>\n<\/ul>\n<\/li>\n\\p{L}, \\P{L}<\/code>, etc.)<\/li>\n<\/ul>\n\n
\\h<\/code>:space-or-tab, \\t<\/code>:tab<\/li>\n\n
\\r<\/code>, \\n<\/code>:carriage return and line feed<\/li>\n\\R<\/code>:generic newline php java-8<\/li>\n<\/ul>\n<\/li>\n\\H<\/code>:Non horizontal whitespace character, \\V<\/code>:Non vertical whitespace character, \\N<\/code>:Non line feed character pcre php5 java-8<\/li>\n\\v<\/code>:vertical tab, \\e<\/code>:the escape character<\/li>\n<\/ul>\n