In a regular expression, parentheses can be used to group regex tokens together and for creating backreferences backreferences allow you to reuse part of the regex match in the regex, or in the replacement text. The current regex returns the open parenthesis after -sin, and the last open parenthesis appreciate any further help.
Python regex: matching a parenthesis within parenthesis ask question first of all, using \(isn't enough to match a parenthesis for regular expression literals – phooji mar 18 '11 at 21:00 @paulo: what are you trying to do with that match, verify the format.
The current regex returns the open parenthesis after -sin, and the last open parenthesis appreciate any further help edited by ericericericeric monday, july 07, 2008 3:03 pm added clarification of bad regex matches.
What is the difference between square brackets and parentheses in a regex ask question and therefore both matches and fails faster than using your previous regular expression difference between square brackets  and vertical bar | 1 what regular expression [[:space:][:digit:]]+ stands for in r. What is the regular expression for matching '(' in a string following is the scenario : i have a string str = abc(efg) i want to split the string at '(' using regular expressionfor that.
What is the regular expression for matching '(' in a string following is the scenario : i have a string str = abc(efg) i want to split the string at '(' using regular expressionfor that i am using arraysaslist(patterncompile(/()split(str)) but i am getting the following exception.