Q59085: Replacing Normal String Takes Longer Than Regular Expression
Article: Q59085 Product(s): See article Version(s): 1.00 1.02 | 1.00 1.02 Operating System(s): MS-DOS | OS/2 Keyword(s): ENDUSER | buglist1.00 buglist1.02 | mspl13_basic Last Modified: 15-MAR-1990 Replacing a regular expression takes less time than replacing a normal string in the Microsoft M Editor, Versions 1.00 and 1.02. To demonstrate the time difference, perform test replacements in the following manner: 1. Load the M Editor with a large file -- greater than 5000 lines. 2. Perform and time a replacement on a regular expression, one that fails to match in the file, for example: arg arg CTRL+L zzzz <- search for this regular expression zzzz <- replace with this regular expression 3. Perform and time a replacement on a normal string (one that fails to match in the file), for example: arg CTRL+L zzzz <- search for this string zzzz <- replace with this string The string replacement may take twice as long as the regular-expression replacement. To obtain the higher replace speed, use the regular-expression replacement (arg arg CTRL+L) even when you are not fully using the regular-expression syntax. Note that a psearch on a regular expression psearch is NOT quicker than a psearch on a normal string. Microsoft has confirmed this to be a problem in Versions 1.00 and 1.02. We are researching this problem and will post new information here as it becomes available. For details on regular expression, refer to the "Microsoft Editor User's Guide," Chapter 5, "Regular Expressions."
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