Regular Expressions for Perl

1, "." : Any single character (except ' \ n ');

2, "*": match the preceding paragraph 0~n times;

3, "+": match the preceding paragraph 1~n times;

4, "?" : Match the preceding 0~1 times;

5.1, "\1" or "\2": Reverse reference;

5.2, "\g{n}": direction reference, if N is negative, then the relative response reference;

6, "|" : "or" match;

7.1, "[]": Character set single character matching;

7.2, "[^]": Reverse character set single character matching;

8.1, "\d": [0-9] (Reverse matching: "\d"); "[\d\d]": Any character (including ' \ n ');

8.2, "\w": [a-za-z0-9_] (Reverse matching: "\w");

8.3, "\s": [\f\t\n\r] (Reverse matching: "\s"); ( note the last space );

8.4, "\h": [\ t]; (match the horizontal blank, note the last space )

8.5, "\v": [\f\n\r]; (Matching vertical blanks)

8.6, "\ r": Cross-artificial system break match;

9, "//" or "m//" or "m<>" or "m%%" and so on: pattern matching;

10.1, "I": case-insensitive modifier;

10.2, "/S": Enable "." Match ' \ n ' modifier;

10.3, "/x": Ignore the pattern blank and comment (' # ' after part);

11.1, "^": Beginning anchor position;

11.2, "$": line tail anchor position; ("\^\s*$\": matches any blank line)

11.3, "\b": Word anchor position (with ' \w ' as the standard, direction matching \b); ("\bansersion" and "\bansersion\b" match: Ansersiona, ansersion__ab134, but former match ansersion , the latter does not match )

12, "=~": binding operation;

13, "($val)": Use variables;

14, "$" or "$" and so on: "()" mode capture variables;

Regular Expressions for Perl