Warning: preg_match() [function.preg-match]: Unknown modifier '-'
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Warning: preg_replace(): Unknown modifier
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how to define regex (preg_replace) to removes space between number character
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PHP regex delimiter, what's the point?
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In a java regex, how can I get a character class e.g. [a-z] to match a - minus sign?
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Reference - What does this regex mean?
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PHP regex - valid float number
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PHP preg_match (.*) not matching past line breaks
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Suppress error with @ operator in PHP
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Match with grep when pattern contains hyphen "-"
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postfix header_checks using regexp proper setup
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Ignore html tags in preg_replace
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Create preg_match for password validation allowing (!@#$%)
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Warning: strpos() [function.strpos]: Empty delimiter
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Is there a PHP function that can escape regex patterns before they are applied?
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PHP conditionals, brackets needed?
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Uncertainty in parenthesis
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Reference - What does this error mean in PHP?