Basis Errors and Solutions

Incorrect matches when using find_next( )

June 26, 2009 at 11:36 pm

[beginning] [cl_abap_regex] [expressions] [incorrect] [incorrect string] [incorrect syntax] [line] [login incorrect] [match] [of] [regex] [regexp] [Regular]

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Symptom

If you use anchor characters, the methods find_next( ) and replace_next( ) of class cl_abap_matcher find additional, incorrect matches.
Other terms

Regular expressions, beginning of line, cl_abap_regex, match, regex, regexp
Reason and Prerequisites

If the methods find_next( ) and replace_next( ) are called several times, the anchor characters ^, \A, \b, and \< may match incorrectly after the first match has been found.
For example:
CREATE OBJECT regex EXPORTING pattern = '^-+a+'.
matcher = regex->create_matcher( text = ‘–aa–aa–aab–’ ).
Here, only a match at offset 0 would be correct; however, due to the error, multiple calls of matcher->find_next( ) also return matches at offsets 4 and 8.
Solution

If the error description above applies to your situation, install the current version of the ABAP kernel. For the lowest patch level for the relevant release, see the section “Support Package patch level”.
(Patch text: ‘fixed anchor handling in find_next( )’)
Check SAP Service Marketplace to see whether the patch is already available for your platform, and apply it in accordance with Note 19466.

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