Method of Java regular expression processing special character escape

Regular requires escape characters

'$','(',')','*','+','.',' [',']','?','\\','^',' {','}','|'

Abnormal phenomena:

java. util. regex. PatternSyntaxException: Dangling Meta. character '*' near index 0

resolvent

Add \ \ escape to special characters.

Note: Although [] can be used under some conditions, it will be reported as follows when the (, [, {range boundary start characters do not match:

Abnormal phenomenon

java. util. regex. PatternSyntaxException: Illegal repetition near index 50

The special word code of Java filtering regular expression is as follows (Note: \ \ the first replacement is required, otherwise there will be a logic bug when replacing the replace method)

summary

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