'freemarker string split and substring

I have a string in the following format

aa_bbbbb_ccccc

length of aa is fixed and b's and c's are of variable length. I need to capture the bbbbb from this string using freemarker.

string yaml freemarker

Solution 1:^[1]

If s stores that string, the expression s?split('_')[1] evaluates to bbbbb.

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Solution	Source
Solution 1	ddekany