Please pay attention that our capturing group (.*?) performs alazy searchfor text between two brackets - from the first [ to the first ]. A capturing group without a question mark (.*) would do agreedy searchand capture everything from the first [ to the last ]. With the pattern in...
Case Insensitivity:In regular expressions, the “case insensitivity” modifier allows you to match patterns without distinguishing between uppercase and lowercase letters. It’s denoted by the letter ‘i’ and can be added to the end of the regular expression pattern using the syntax “/pattern/i...
至于获取括号之间的数字，请参见此链接https://regex101.com/r/o5wAmh/1了解详细信息。这里有一种不...
Ranges: They can be specified by using the hyphen character (-) between two valid characters. For example: [a-z] matches any lowercase letter (a, b, c, ... until z). [abc1-5] matches either a, b or c, or a digit between 1 and 5. POSIX-like classes: A whole set of predefi...
Inside the square brackets,-indicates a range, unless-is the first character or is escaped with a\. [xyz]matches "x", "y", and "z" [^abc]matches any character except "a", "b", or "c" [a-d]matches "a", "b", "c", or "d" ...
Alteration:The|character can be used to denote alternation between two expressions. For example:A|B. Concatenation:Expressions can be concatenated together to form a new expression. For example:ABC. One or More:The+character can be used to indicate that the preceding expression must occur one or...
In the test1 function, I’m creating a regular expression that matches either a capital or lowercase S, followed by one or zero single characters followed by e. In other words, I’m matching Se and se, possibly with a single character between the two letters. ...
In the test1 function, I’m creating a regular expression that matches either a capital or lowercase S, followed by one or zero single characters followed by e. In other words, I’m matching Se and se, possibly with a single character between the two letters. ...
A set is a set of characters inside a pair of square brackets[]with a special meaning: SetDescriptionTry it [arn]Returns a match where one of the specified characters (a,r, orn) is presentTry it » [a-n]Returns a match for any lower case character, alphabetically betweenaandnTry it...
It helps to specify a range, but only if it appears within brackets ([ ]), and between two other characters within the range. Otherwise, the minus sign is a literal character and doesn't need to be escaped. By the way, most special characters lose their special meaning inside brackets,...