Matches chemical formula written with latex, ex: H_2O, C_5H_12, Pb(NO_3)_2

Updated: Identifies chemical formulae written with latex

Finds all email addresses on a page.

Works with single and multi-line

Find first ocurrence of a irregular character in a file or dir name.

You want to match 4 groups of text where group 1 is exact, group 2 is anything, group 3 is exact, group 4 is anything

exclude word exactly - case insensitive

[collapse] tags are replaced with html code attributes

Any 'abc' string with at least one a and one b

Match 8 or more consecutive digits irrespective of it's position in the string with string length between 8 and 20. ex: 11111111 - match ASD11111111 - match ASD22222222oook - match 777kjoi77777 - no match etc.,