[EMAIL PROTECTED] wrote: > Hi, > > I'm having trouble extracting substrings using regular expression. Here > is my problem: > > Want to find the substring that is immediately before a given > substring. For example: from > "00 noise1 01 noise2 00 target 01 target_mark", > want to get > "00 target 01" > which is before > "target_mark". > My regular expression > "(00.*?01) target_mark" > will extract > "00 noise1 01 noise2 00 target 01".
If there is a character that can't appear in the bit between the numbers then use everything-but-that instead of . - for example if spaces can only appear as you show them, use "(00 [^ ]* 01) target_mark" or "(00 \S* 01) target_mark" Kent -- http://mail.python.org/mailman/listinfo/python-list
