Each character in text a is checked to see if it matches the regular expression b. If it does, it is retained. If not, it is replaced by text c or, if c is empty, it is removed.

Parameters

Parameter	Description
a	Text.
b	Regular expression.
c	Replacement text.

Examples

Parameter a	Parameter b	Parameter c	Result
80336 München	[0-9A-Z]	.	80336.M......
80336 München	[0-9A-Z]		80336M
80336 München	[0-9A-z]		80336Mnchen
80336 München	[^ü]	ue	80336 Muenchen

Note: In order to remove all characters that do not belong to a Base64 block, this function can be used with the regular expression [A-Za-z0-9+/=] in parameter b and an empty parameter c.