implement regex/trim/split expr

[zhouyuan]

Is your feature request related to a problem or challenge? Please describe what you are trying to do.
implement regex/trim/split expr

Describe the solution you'd like
regex/trim/split expr are commonly used in string ops

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

Additional context
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[zhouyuan]

@PHILO-HE