Tool for Converting STR Sequence Data to Bracketed Sequence

Question

[lattarulol]

Can anyone recommend a tool (preferably open source) that converts STR sequence data to its bracketed notation? For example, with a repeat motif of TCTA, the following STR sequence

TCTATCTGTCTGTCTGTCTATCTATCTATCTATCTATCTATCTATCTATCTATCTATCTATCTA

would get converted to [TCTA][TCTG]3[TCTA]12

Thank you!