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| <h4 class="subsection">10.3.2 Flags for POSIX Regular Expressions</h4> |
| |
| <p>These are the bit flags that you can use in the <var>cflags</var> operand when |
| compiling a regular expression with <code>regcomp</code>. |
| |
| <dl> |
| <!-- regex.h --> |
| <!-- POSIX.2 --> |
| <dt><code>REG_EXTENDED</code><dd>Treat the pattern as an extended regular expression, rather than as a |
| basic regular expression. |
| |
| <!-- regex.h --> |
| <!-- POSIX.2 --> |
| <br><dt><code>REG_ICASE</code><dd>Ignore case when matching letters. |
| |
| <!-- regex.h --> |
| <!-- POSIX.2 --> |
| <br><dt><code>REG_NOSUB</code><dd>Don't bother storing the contents of the <var>matches-ptr</var> array. |
| |
| <!-- regex.h --> |
| <!-- POSIX.2 --> |
| <br><dt><code>REG_NEWLINE</code><dd>Treat a newline in <var>string</var> as dividing <var>string</var> into multiple |
| lines, so that ‘<samp><span class="samp">$</span></samp>’ can match before the newline and ‘<samp><span class="samp">^</span></samp>’ can |
| match after. Also, don't permit ‘<samp><span class="samp">.</span></samp>’ to match a newline, and don't |
| permit ‘<samp><span class="samp">[^...]</span></samp>’ to match a newline. |
| |
| <p>Otherwise, newline acts like any other ordinary character. |
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