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11. If (*THEN) is present in a group that is called as a subroutine, its action | 11. If any of the backtracking control verbs are used in an assertion or in a |
is limited to that group, even if the group does not contain any | characters. | subpattern that is called as a subroutine (whether or not recursively), their |
| effect is confined to that subpattern; it does not extend to the surrounding |
| pattern. This is not always the case in Perl. In particular, if (*THEN) is |
| present in a group that is called as a subroutine, its action is limited to |
| that group, even if the group does not contain any | characters. There is one |
| exception to this: the name from a *(MARK), (*PRUNE), or (*THEN) that is |
| encountered in a successful positive assertion <i>is</i> passed back when a |
| match succeeds (compare capturing parentheses in assertions). Note that such |
| subpatterns are processed as anchored at the point where they are tested. |
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12. There are some differences that are concerned with the settings of captured |
12. There are some differences that are concerned with the settings of captured |
Line 129 an error is given at compile time.
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Line 137 an error is given at compile time.
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14. Perl recognizes comments in some places that PCRE does not, for example, |
14. Perl recognizes comments in some places that PCRE does not, for example, |
between the ( and ? at the start of a subpattern. If the /x modifier is set, |
between the ( and ? at the start of a subpattern. If the /x modifier is set, |
Perl allows whitespace between ( and ? but PCRE never does, even if the | Perl allows white space between ( and ? but PCRE never does, even if the |
PCRE_EXTENDED option is set. |
PCRE_EXTENDED option is set. |
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Line 203 Cambridge CB2 3QH, England.
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Line 211 Cambridge CB2 3QH, England.
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REVISION |
REVISION |
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Last updated: 08 Januray 2012 | Last updated: 01 June 2012 |
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Copyright © 1997-2012 University of Cambridge. |
Copyright © 1997-2012 University of Cambridge. |
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