^ - Caret

Caret symbol (^) match with the early of the string which is to examine whether the string is started with the character that is given or not. For example:

• ^m will examine whether string is started with m such as my, myskill, myth, etc.
• ^m will examine whether string is started with my such as myths, myriad, etc.

$ - Dollar

The Dollar Symbol ($) match with the end of string which is examining whether the string is ended with the character that is given or not. For example:

• s$ will examine string that is ended such as seeks, ends, s, etc.
• ks$ will examine string that is ended with ks such as streaks, bleaks, ks, etc.

. - Dot

Dot symbol (.) only match with a character except for new basis character (\n).

For example:

• a.b will examine string that consist of any characters in where dot is placed such as acb, acbd, abbb, etc.
• .. will examine whether string consist of at least 2 characters.

| - Or

Or symbol has a function as operator, or it means to examine whether the pattern before or after the symbol exist in the string or not. For example,

• a|b will match with any of the string that consist of a or b such as acd, bcd, abcd, etc

? - Question Mark

Question Mark (?) will examine whether the string before the question mark in regular expression appears at least once or not at all. For example:

• ab?c will match for string ac, acb, acb, dabc but will not match to abbc because it has 2 b’s. That also will not match to abdc because b is not followed by c.