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Automatic delimiters


This chapter doesn't contain PHP code snippets, because PHP PCRE require delimiters. There is no way to omit them in Vanilla PHP.


Thanks to automatic delimiters, one can use regular expressions without brain strain and without spending time, choosing a suitable delimiter.


Delimited pattern#

Calling method delimited() on any instance of T-Regx PatternInterface returns a pattern, as it will be used with PHP PCRE methods.

echo pattern('Welcome/Or not')->delimited() . "\n";
echo pattern('')->delimited() . "\n";
echo pattern('')->delimited() . "\n";
#Welcome/Or not#

PCRE-style patterns#

If the was constructed with PcrePattern::of(), method delimited() returns the pattern unchanged.

PcrePattern::of('#Welcome/Or not#')->delimited();
#Welcome/Or not#


There are two ways of using patterns with PCRE modifiers:

  • Either pass a second argument to pattern()/Pattern::of():

    // global function
    pattern('[A-Z][a-z]+', 'i')->match($subject)->first();
    // static method
    Pattern::of('[A-Z][a-z]+', 'i')->match($subject)->first();
    // prepared patterns
    Pattern::inject('[A-Z]@', [$_GET['name']], 'i')->search($subject)->first();
  • or use an old-school pattern:


I want to break it#

T-Regx has a set of predefined, suitable delimiters (like /, #, ~, %, etc.) and simply uses the first one, that doesn't occur in your pattern. If you exhaust each of them; if you use every possible, predefined, suitable delimiter - it will throw ExplicitDelimiterRequiredException.

In that case, you simply have to use an explicit delimiter with PcrePattern::of().

If you think another automatic delimiter can be used, please create a github issue.

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