Script to replace a list of regex search patterns within a directory structure

replaceRegexPatterns.sh

#!/bin/bash

# Parameters
BASE_DIRECTORY='ToReplace'
FILE_PATTERN='*Controller.java'

# Perform find and replace operation for given search and replacement patterns
perform_replace() {
    local SEARCH_PATTERN=$1
    local REPLACEMENT_PATTERN=$2
    local file=$3
    
    SEARCH_PATTERN_HITS=$(grep -c -E "$SEARCH_PATTERN" "$file")
    echo "- $SEARCH_PATTERN_HITS time(s) replaced $SEARCH_PATTERN with $REPLACEMENT_PATTERN"
    
    sed -r -i "s/$SEARCH_PATTERN/$REPLACEMENT_PATTERN/g" "$file"
    # sed --debug -r -i "s/$SEARCH_PATTERN/$REPLACEMENT_PATTERN/g" "$file"
}

# Find all files in a directory (recursively) that match a specific pattern
files=$(find $BASE_DIRECTORY -type f -name $FILE_PATTERN)

# Iterate over each file and perform the find and replace operation for each pattern pair
# Matching groups are written as \1 not $1 (sed syntax)
echo ""
for file in $files; do
    echo "Processing file $file ..."
    perform_replace 'SimpleSearchPattern' 'SimpleReplacement' "$file"
    perform_replace 'SearchPatternWithBracketsAndMatchingGroup\((.+)\)' 'ReplacementWithBracketsAndMatchingGroup(matchingGroup = \1)' "$file"
    echo ""
done