# 5.78s - CORE:regcomp if( $l_line =~ m/$REGEXP_READONLY/ ) {
    # 0.74s - CORE:regcomp if( $l_line =~ m/${\REGEXP_CONSTANT}/ ) {
    # 0.00s                if( $l_line =~ m/999986/ ) {
    # 0.73s - CORE:regcomp if( $l_line =~ m/$REGEXP_READONLY/o ) {  # /o
    # 1.33s - CORE:regcomp if( $l_line =~ $l_search_r ) {           # qr//
    # 0.74s - CORE:regcomp if( $l_line =~ m/$l_search/ ) {
    # 0.69s - CORE:regcomp if( $l_line =~ m/$l_search/o ) {         # /o