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Message: [QUOTE="Thomas Werzmirzowsky, post: 4795374"] Hi, i need a regular expression that matches (for example) the following strings: $$[mark] fkajdfka $$[/mark] $$[ mark ] dfalkdfj $$[ /mark ] $$[abc ] dkjfakldf $$[ / abc ] and so on. To do this i "designed" this regular expression (spaces are just for better reading): \$ \$ \[ \s* (.+?) \s* \] .+? \$ \$ \[ \s* \/ \s* \1 \s* \] And it works :) But now i want that befor the <mark> in the first $$[ ] can be a !. So i changed my expression to: \$ \$ \[ \s* (!?) \s* (.+?) \s* \] .+? \$ \$ \[ \s* \/ \s* \2 \s* \] And it doesn't work :( I even tried (\!?) instead of (!?) but this doesn't work, too :( Can anybody tell me why the second expression doesn't work? Thanks in advance :) Thomas W [/QUOTE]