regular expression example

Example 1: regex examples

\d         matches a single character that is a digit -> Try it!\w         matches a word character (alphanumeric character plus underscore) -> Try it!\s         matches a whitespace character (includes tabs and line breaks).          matches any character -> Try it!

Example 2: regex examples

a(bc)           parentheses create a capturing group with value bc -> Try it!a(?:bc)*        using ?: we disable the capturing group -> Try it!a(?<foo>bc)     using ?<foo> we put a name to the group -> Try it!

Example 3: regex examples

[abc]            matches a string that has either an a or a b or a c -> is the same as a|b|c -> Try it![a-c]            same as previous[a-fA-F0-9]      a string that represents a single hexadecimal digit, case insensitively -> Try it![0-9]%           a string that has a character from 0 to 9 before a % sign[^a-zA-Z]        a string that has not a letter from a to z or from A to Z. In this case the ^ is used as negation of the expression -> Try it!

Example 4: regex examples

a(b|c)     matches a string that has a followed by b or c (and captures b or c) -> Try it!a[bc]      same as previous, but without capturing b or c

Example 5: regex examples

\$\d       matches a string that has a $ before one digit -> Try it!

Example 6: regex examples

\D         matches a single non-digit character -> Try it!