Similar to regular parentheses, but the substring matched by the group isaccessible via the symbolic group name name. Group names must be validPython identifiers, and each group name must be defined only once within aregular expression. A symbolic group is also a numbered group, just as ifthe group were not named.
You need to create a set of escaped (with ) parentheses (that match the parentheses) and a group of regular parentheses that create your capturing group:
Regex with Parenthesis - Stack Overflow
This module provides regular expression matching operations similar tothose found in Perl. Both patterns and strings to be searched can beUnicode strings as well as 8-bit strings.
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The parenthesis and are used as grouping mechanism and scope operators in regexps. You have to escape them (and any other control symbols) via backslash, e.g. .
C# Regular Expressions - O'Reilly Media
the value inside the parenthesis
A regular expression (or RE) specifies a set of strings that matches it; thefunctions in this module let you check if a particular string matches a givenregular expression (or if a given regular expression matches a particularstring, which comes down to the same thing).
You want to get string inside the square bracket
Regular expressions can contain both special and ordinary characters. Mostordinary characters, like , , or , are the simplest regularexpressions; they simply match themselves. You can concatenate ordinarycharacters, so matches the string . (In the rest of thissection, we’ll write RE’s in , usually without quotes, andstrings to be matched .)
Regular Expression Reference: ..
Repetition qualifiers (, , , , etc) cannot bedirectly nested. This avoids ambiguity with the non-greedy modifier suffix, and with other modifiers in other implementations. To apply a secondrepetition to an inner repetition, parentheses may be used. For example,the expression matches any multiple of six characters.
Regex Tutorial—Regex Cookbook - RexEgg
Make sure to be in global mode (g flag), case insensitive and to have the dot all option on. This regular expression will match all HTML tags and their attributes. This will LEAVE the content of the tags within the string.