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{{mirc title|$regerrstr Identifier}}'''$regerrstr''' returns the PCRE error string of the compile function for the last regex call made, if any.
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{{mirc title|$regerrstr Identifier}}'''$regerrstr''' returns the PCRE error string for the last regex call made, if any  
  
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A regular expression must be compiled first, and then it's executed against a string.
 
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If an error occurs in the compile function, $regerrstr is filled with an error string, corresponding to a positive number (listed below), but only the string is returned.
 
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$regex and similar regex functions reporting number of matches ($regsubex with output variable or $regsub) will report a value of -14.
 
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This value actually comes from the exec function, this is for convenience. $regex etc always return a negative value when an error occurs.
 
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-14 is supposed to mean an internal pcre error, but this is only the case if $regerrstr is not set, then. You can find more info about on the regex page
 
  
 
== Synopsis ==
 
== Synopsis ==
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== List of error ==
 
== List of error ==
  
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* 1: \ at end of pattern
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0  no error
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* 2: \c at end of pattern
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          1  \ at end of pattern
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* 3: unrecognized character follows \
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          2  \c at end of pattern
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* 4: numbers out of order in {} quantifier
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          3  unrecognized character follows \
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* 5: number too big in {} quantifier
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          4  numbers out of order in {} quantifier
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* 6: missing terminating ] for character class
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          5  number too big in {} quantifier
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* 7: invalid escape sequence in character class
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          6  missing terminating ] for character class
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* 8: range out of order in character class
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          7  invalid escape sequence in character class
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* 9: nothing to repeat
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          8  range out of order in character class
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* 10: [this code is not in use]
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          9  nothing to repeat
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* 11: internal error: unexpected repeat
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        10  [this code is not in use]
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* 12: unrecognized character after (? or (?-
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        11  internal error: unexpected repeat
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* 13: POSIX named classes are supported only within a class
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        12  unrecognized character after (? or (?-
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* 14: missing )
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        13  POSIX named classes are supported only within a class
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* 15: reference to non-existent subpattern
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        14  missing )
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* 16: erroffset passed as NULL
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        15  reference to non-existent subpattern
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* 17: unknown option bit(s) set
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        16  erroffset passed as NULL
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* 18: missing ) after comment
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        17  unknown option bit(s) set
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* 19: [this code is not in use]
+
        18  missing ) after comment
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* 20: regular expression is too large
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        19  [this code is not in use]
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* 21: failed to get memory
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        20  regular expression is too large
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* 22: unmatched parentheses
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        21  failed to get memory
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* 23: internal error: code overflow
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        22  unmatched parentheses
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* 24: unrecognized character after (?<
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        23  internal error: code overflow
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* 25: lookbehind assertion is not fixed length
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        24  unrecognized character after (?<
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* 26: malformed number or name after (?(
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        25  lookbehind assertion is not fixed length
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* 27: conditional group contains more than two branches
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        26  malformed number or name after (?(
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* 28: assertion expected after (?(
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        27  conditional group contains more than two branches
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* 29: (?R or (?[+-]digits must be followed by )
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        28  assertion expected after (?(
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* 30: unknown POSIX class name
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        29  (?R or (?[+-]digits must be followed by )
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* 31: POSIX collating elements are not supported
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        30  unknown POSIX class name
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* 32: this version of PCRE is compiled without UTF support
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        31  POSIX collating elements are not supported
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* 33: [this code is not in use]
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        32  this version of PCRE is compiled without UTF support
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* 34: character value in \x{} or \o{} is too large
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        33  [this code is not in use]
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* 35: invalid condition (?(0)
+
        34  character value in \x{} or \o{} is too large
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* 36: \C not allowed in lookbehind assertion
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        35  invalid condition (?(0)
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* 37: PCRE does not support \L, \l, \N{name}, \U, or \u
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        36  \C not allowed in lookbehind assertion
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* 38: number after (?C is > 255
+
        37  PCRE does not support \L, \l, \N{name}, \U, or \u
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* 39: closing ) for (?C expected
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        38  number after (?C is > 255
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* 40: recursive call could loop indefinitely
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        39  closing ) for (?C expected
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* 41: unrecognized character after (?P
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        40  recursive call could loop indefinitely
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* 42: syntax error in subpattern name (missing terminator)
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        41  unrecognized character after (?P
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* 43: two named subpatterns have the same name
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        42  syntax error in subpattern name (missing terminator)
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* 44: invalid UTF-8 string (specifically UTF-8)
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        43  two named subpatterns have the same name
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* 45: support for \P, \p, and \X has not been compiled
+
        44  invalid UTF-8 string (specifically UTF-8)
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* 46: malformed \P or \p sequence
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        45  support for \P, \p, and \X has not been compiled
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* 47: unknown property name after \P or \p
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        46  malformed \P or \p sequence
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* 48: subpattern name is too long (maximum 32 characters)
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        47  unknown property name after \P or \p
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* 49: too many named subpatterns (maximum 10000)
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        48  subpattern name is too long (maximum 32 characters)
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* 50: [this code is not in use]
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        49  too many named subpatterns (maximum 10000)
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* 51: octal value is greater than \377 in 8-bit non-UTF-8 mode
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        50  [this code is not in use]
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* 52: internal error: overran compiling workspace
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        51  octal value is greater than \377 in 8-bit non-UTF-8 mode
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* 53: internal error: previously-checked referenced subpattern not found
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        52  internal error: overran compiling workspace
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* 54: DEFINE group contains more than one branch
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        53  internal error: previously-checked referenced subpattern
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* 55: repeating a DEFINE group is not allowed
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              not found
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* 56: inconsistent NEWLINE options
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        54  DEFINE group contains more than one branch
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* 57: \g is not followed by a braced, angle-bracketed, or quoted name/number or by a plain number
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        55  repeating a DEFINE group is not allowed
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* 58: a numbered reference must not be zero
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        56  inconsistent NEWLINE options
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* 59: an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT)
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        57  \g is not followed by a braced, angle-bracketed, or quoted
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* 60: (*VERB) not recognized or malformed
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              name/number or by a plain number
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* 61: number is too big
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        58  a numbered reference must not be zero
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* 62: subpattern name expected
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        59  an argument is not allowed for (*ACCEPT), (*FAIL), or (*COMMIT)
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* 63: digit expected after (?+
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        60  (*VERB) not recognized or malformed
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* 64: ] is an invalid data character in JavaScript compatibility mode
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        61  number is too big
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* 65: different names for subpatterns of the same number are not allowed
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        62  subpattern name expected
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* 66: (*MARK) must have an argument
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        63  digit expected after (?+
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* 67: this version of PCRE is not compiled with Unicode property support
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        64  ] is an invalid data character in JavaScript compatibility mode
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* 68: \c must be followed by an ASCII character
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        65  different names for subpatterns of the same number are
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* 69: \k is not followed by a braced, angle-bracketed, or quoted name
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              not allowed
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* 70: internal error: unknown opcode in find_fixedlength()
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        66 (*MARK) must have an argument
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* 71: \N is not supported in a class
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        67 this version of PCRE is not compiled with Unicode property
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* 72: too many forward references
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              support
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* 73: disallowed Unicode code point (>= 0xd800 && <= 0xdfff)
+
        68  \c must be followed by an ASCII character
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* 74: invalid UTF-16 string (specifically UTF-16)
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        69  \k is not followed by a braced, angle-bracketed, or quoted name
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* 75: name is too long in (*MARK), (*PRUNE), (*SKIP), or (*THEN)
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        70  internal error: unknown opcode in find_fixedlength()
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* 76: character value in \u.... sequence is too large
+
        71  \N is not supported in a class
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* 77: invalid UTF-32 string (specifically UTF-32)
+
        72  too many forward references
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* 78: setting UTF is disabled by the application
+
        73  disallowed Unicode code point (>= 0xd800 && <= 0xdfff)
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* 79: non-hex character in \x{} (closing brace missing?)
+
        74  invalid UTF-16 string (specifically UTF-16)
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* 80: non-octal character in \o{} (closing brace missing?)
+
        75  name is too long in (*MARK), (*PRUNE), (*SKIP), or (*THEN)
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* 81: missing opening brace after \o
+
        76  character value in \u.... sequence is too large
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* 82: parentheses are too deeply nested
+
        77  invalid UTF-32 string (specifically UTF-32)
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* 83: invalid range in character class
+
        78  setting UTF is disabled by the application
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* 84: group name must start with a non-digit
+
        79  non-hex character in \x{} (closing brace missing?)
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* 85: parentheses are too deeply nested (stack check)
+
        80  non-octal character in \o{} (closing brace missing?)
 +
        81  missing opening brace after \o
 +
        82  parentheses are too deeply nested
 +
        83  invalid range in character class
 +
        84  group name must start with a non-digit
 +
        85  parentheses are too deeply nested (stack check)
  
 
== Example ==
 
== Example ==
−
<source lang="mIRC">//echo -a $regex($str(a,2700),/(?<=a*)/) $regerrstr</source>
+
<source lang="mIRC">//echo -a $regex($str(a,2700),/a*(a*)*b/) $regerrstr</source>
  
 
== Compatibility ==
 
== Compatibility ==

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