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As you can see in Figure A-9, no match is found in OpenOffice.org Writer. Numeric digits in OpenOffice.org

Writer use nonstandard syntax in that OpenOffice.org Writer lacks support for the

\d

metacharacter.

One solution to this type of problem in OpenOffice.org Writer is to use character classes. For now, it is

sufficient to note that the regular expression pattern

[0-9][0-9][0-9]

gives the same results as the pattern

\d\d\d

, because the meaning of

[0-9][0-9][0-9]

is the same as

\d\d\d

. The use of that character class to match three successive numeric digits in the file

ABC123.txt

is shown in Figure A-10.

Another syntax in OpenOffice.org Writer uses POSIX metacharacters.

The

findstr

utility also lacks the

\d

metacharacter, so if you want to use it to find matches, you must

use the preceding character class shown in the command line, as follows:

findstr /N [0-9][0-9][0-9] ABC123.txt

Figure A-10

323

Appendix A: Simple Regular Expressions

bapp01.qxd:bapp01 10:47 323

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