QRegExpValidator ¶

概要 ¶

详细描述 ¶

QRegExpValidator uses a regular expression (regexp) to determine whether an input string is Acceptable , 中间体 ，或 Invalid . The regexp can either be supplied when the QRegExpValidator is constructed, or at a later time.

当 QRegExpValidator determines whether a string is Acceptable or not, the regexp is treated as if it begins with the start of string assertion ( ^ ) and ends with the end of string assertion ( $ ); the match is against the entire input string, or from the given position if a start position greater than zero is given.

If a string is a prefix of an Acceptable string, it is considered 中间体 . For example, “” and “A” are 中间体 for the regexp [A-Z][0-9] (whereas “_” would be Invalid ).

For a brief introduction to Qt’s regexp engine, see QRegExp .

用法范例：

# regexp: optional '-' followed by between 1 and 3 digits
rx = QRegExp("-?\\d{1,3}")
validator = QRegExpValidator(rx, self)
edit = QLineEdit(self)
edit.setValidator(validator)
											

Below we present some examples of validators. In practice they would normally be associated with a widget as in the example above.

# integers 1 to 9999
rx = QRegExp("[1-9]\\d{0,3}")
# the validator treats the regexp as "^[1-9]\\d{0,3}$"
v = QRegExpValidator(rx, 0)
pos = 0
s = "0"
v.validate(s, pos)    # returns Invalid
s = "12345"
v.validate(s, pos)    # returns Invalid
s = "1"
v.validate(s, pos)    # returns Acceptable
rx.setPattern("\\S+")            # one or more non-whitespace characters
v.setRegExp(rx)
s = "myfile.txt"
v.validate(s, pos) # Returns Acceptable
s = "my file.txt"
v.validate(s, pos) # Returns Invalid
# A, B or C followed by exactly five digits followed by W, X, Y or Z
rx.setPattern("[A-C]\\d{5}[W-Z]")
v.setRegExp(rx)
s = "a12345Z"
v.validate(s, pos)        # Returns Invalid
s = "A12345Z"
v.validate(s, pos)        # Returns Acceptable
s = "B12"
v.validate(s, pos)        # Returns Intermediate
# match most 'readme' files
rx.setPattern("read\\S?me(\.(txt|asc|1st))?")
rx.setCaseSensitive(false)
v.setRegExp(rx)
s = "readme"
v.validate(s, pos) # Returns Acceptable
s = "README.1ST"
v.validate(s, pos) # Returns Acceptable
s = "read me.txt"
v.validate(s, pos) # Returns Invalid
s = "readm"
v.validate(s, pos) # Returns Intermediate
											

另请参阅

QRegExp QIntValidator QDoubleValidator 设置编辑器范例

class QRegExpValidator ( [ parent=None ] ) ¶

QRegExpValidator(rx[, parent=None])

param parent

QObject

param rx

QRegExp

构造验证器采用 parent object that accepts any string (including an empty one) as valid.

构造验证器采用 parent object that accepts all strings that match the regular expression rx .

The match is made against the entire string; e.g. if the regexp is [A-Fa-f0-9]+ it will be treated as ^[A-Fa-f0-9]+$ .

PySide2.QtGui.QRegExpValidator. regExp ( ) ¶

返回类型

QRegExp

另请参阅

setRegExp()

PySide2.QtGui.QRegExpValidator. regExpChanged ( regExp ) ¶

参数

regExp – QRegExp

PySide2.QtGui.QRegExpValidator. setRegExp ( rx ) ¶

参数

rx – QRegExp

另请参阅

regExp()