The child is the character information item, meaning that the item contains alphanumerical characters.
子项是字符信息项，即包含字母数字字符的项。
The regular expression is changed to locate a four-digit number, followed by a dash, followed by a three-digit alphanumerical sequence.
将正则表达式修改为寻找4位数字，后面跟一个连字符，最后是3位的字符数字序列。
The regular expression is changed to locate a four-digit number, followed by a dash, followed by a three-digit alphanumerical sequence.
将正则表达式修改为寻找4位数字，后面跟一个连字符，最后是3位的字符数字序列。
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