Match any number of character:
egrep -r "AMS*Method" ./ --exclude-dir logs 2>/dev/null
Match exact one character:
egrep -r ‘AMS[[:alnum:]]Method‘ ./ --exclude-dir logs 2>/dev/null
Match at least one character:
egrep -r "AMS[[:alnum:]]+Method" ./ --exclude-dir logs 2>/dev/null
egrep -r ‘AMS[[:alnum:]]+Method‘ ./ --exclude-dir logs 2>/dev/null
原文：https://www.cnblogs.com/zhangzhihui/p/13536001.html